| Record Information |
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| Version | 5.0 |
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| Status | Detected and Quantified |
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| Creation Date | 2006-05-22 15:12:46 UTC |
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| Update Date | 2023-02-21 17:16:34 UTC |
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| HMDB ID | HMDB0003269 |
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| Secondary Accession Numbers | |
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| Metabolite Identification |
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| Common Name | Nicotinuric acid |
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| Description | Nicotinuric acid is an acylglycine. Acylglycines are normally minor metabolites of fatty acids. However, the excretion of certain acylglycines is increased in several inborn errors of metabolism. In certain cases, the measurement of these metabolites in body fluids can be used to diagnose disorders associated with mitochondrial fatty acid beta-oxidation. Acylglycines are produced through the action of glycine N-acyltransferase (EC 2.3.1.13) which is an enzyme that catalyzes the chemical reaction acyl-CoA + glycine <-> CoA + N-acylglycine. Nicotinuric acid is the major detoxification product of nicotinic acid. It may serve as a simple quantitative index of hepatic biotransformation of nicotinic acid (PMID:3243933 ). |
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| Structure | InChI=1S/C8H8N2O3/c11-7(12)5-10-8(13)6-2-1-3-9-4-6/h1-4H,5H2,(H,10,13)(H,11,12) |
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| Synonyms | | Value | Source |
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| N-(Pyridin-3-ylcarbonyl)glycine | ChEBI | | N-Nicotinylglycine | ChEBI | | Nicotinoylglycine | ChEBI | | Nicotinurate | ChEBI | | Nicotinylglycine | ChEBI | | Nicotinate | Generator | | Nicotinic acid | Generator | | N-(3-Pyridinylcarbonyl)-(9ci)-glycine | HMDB | | N-(3-Pyridinylcarbonyl)-glycine | HMDB | | N-Nicotinoyl-(8ci)-glycine | HMDB | | N-Nicotinoyl-glycine | HMDB | | N-Nicotinurate | HMDB | | N-Nicotinuric acid | HMDB | | Nicotinoyl-glycine | HMDB | | Nicotinuric acid, monosodium salt | HMDB | | Nicotinuric acid | ChEBI |
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| Chemical Formula | C8H8N2O3 |
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| Average Molecular Weight | 180.1607 |
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| Monoisotopic Molecular Weight | 180.053492132 |
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| IUPAC Name | 2-[(pyridin-3-yl)formamido]acetic acid |
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| Traditional Name | nicotinuric acid |
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| CAS Registry Number | 583-08-4 |
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| SMILES | OC(=O)CNC(=O)C1=CN=CC=C1 |
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| InChI Identifier | InChI=1S/C8H8N2O3/c11-7(12)5-10-8(13)6-2-1-3-9-4-6/h1-4H,5H2,(H,10,13)(H,11,12) |
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| InChI Key | ZBSGKPYXQINNGF-UHFFFAOYSA-N |
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| Chemical Taxonomy |
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| Description | Belongs to the class of organic compounds known as n-acyl-alpha amino acids. N-acyl-alpha amino acids are compounds containing an alpha amino acid which bears an acyl group at its terminal nitrogen atom. |
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| Kingdom | Organic compounds |
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| Super Class | Organic acids and derivatives |
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| Class | Carboxylic acids and derivatives |
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| Sub Class | Amino acids, peptides, and analogues |
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| Direct Parent | N-acyl-alpha amino acids |
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| Alternative Parents | |
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| Substituents | - N-acyl-alpha-amino acid
- Nicotinamide
- Pyridine
- Heteroaromatic compound
- Carboximidic acid
- Carboximidic acid derivative
- Carboxylic acid
- Monocarboxylic acid or derivatives
- Propargyl-type 1,3-dipolar organic compound
- Organic 1,3-dipolar compound
- Organoheterocyclic compound
- Azacycle
- Organonitrogen compound
- Organooxygen compound
- Organopnictogen compound
- Organic oxide
- Carbonyl group
- Organic nitrogen compound
- Organic oxygen compound
- Hydrocarbon derivative
- Aromatic heteromonocyclic compound
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| Molecular Framework | Aromatic heteromonocyclic compounds |
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| External Descriptors | |
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| Ontology |
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| Physiological effect | Not Available |
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| Disposition | |
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| Process | Not Available |
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| Role | Not Available |
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| Physical Properties |
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| State | Solid |
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| Experimental Molecular Properties | | Property | Value | Reference |
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| Melting Point | Not Available | Not Available | | Boiling Point | Not Available | Not Available | | Water Solubility | Not Available | Not Available | | LogP | Not Available | Not Available |
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| Experimental Chromatographic Properties | Experimental Collision Cross Sections |
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| Predicted Molecular Properties | |
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| Predicted Chromatographic Properties | Predicted Collision Cross SectionsPredicted Retention Times Underivatized| Chromatographic Method | Retention Time | Reference |
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| Measured using a Waters Acquity ultraperformance liquid chromatography (UPLC) ethylene-bridged hybrid (BEH) C18 column (100 mm × 2.1 mm; 1.7 μmparticle diameter). Predicted by Afia on May 17, 2022. Predicted by Afia on May 17, 2022. | 2.22 minutes | 32390414 | | Predicted by Siyang on May 30, 2022 | 9.2158 minutes | 33406817 | | Predicted by Siyang using ReTip algorithm on June 8, 2022 | 5.48 minutes | 32390414 | | AjsUoB = Accucore 150 Amide HILIC with 10mM Ammonium Formate, 0.1% Formic Acid | 187.1 seconds | 40023050 | | Fem_Long = Waters ACQUITY UPLC HSS T3 C18 with Water:MeOH and 0.1% Formic Acid | 788.4 seconds | 40023050 | | Fem_Lipids = Ascentis Express C18 with (60:40 water:ACN):(90:10 IPA:ACN) and 10mM NH4COOH + 0.1% Formic Acid | 288.0 seconds | 40023050 | | Life_Old = Waters ACQUITY UPLC BEH C18 with Water:(20:80 acetone:ACN) and 0.1% Formic Acid | 62.9 seconds | 40023050 | | Life_New = RP Waters ACQUITY UPLC HSS T3 C18 with Water:(30:70 MeOH:ACN) and 0.1% Formic Acid | 162.6 seconds | 40023050 | | RIKEN = Waters ACQUITY UPLC BEH C18 with Water:ACN and 0.1% Formic Acid | 43.9 seconds | 40023050 | | Eawag_XBridgeC18 = XBridge C18 3.5u 2.1x50 mm with Water:MeOH and 0.1% Formic Acid | 252.2 seconds | 40023050 | | BfG_NTS_RP1 =Agilent Zorbax Eclipse Plus C18 (2.1 mm x 150 mm, 3.5 um) with Water:ACN and 0.1% Formic Acid | 277.6 seconds | 40023050 | | HILIC_BDD_2 = Merck SeQuant ZIC-HILIC with ACN(0.1% formic acid):water(16 mM ammonium formate) | 351.5 seconds | 40023050 | | UniToyama_Atlantis = RP Waters Atlantis T3 (2.1 x 150 mm, 5 um) with ACN:Water and 0.1% Formic Acid | 578.8 seconds | 40023050 | | BDD_C18 = Hypersil Gold 1.9µm C18 with Water:ACN and 0.1% Formic Acid | 38.8 seconds | 40023050 | | UFZ_Phenomenex = Kinetex Core-Shell C18 2.6 um, 3.0 x 100 mm, Phenomenex with Water:MeOH and 0.1% Formic Acid | 916.1 seconds | 40023050 | | SNU_RIKEN_POS = Waters ACQUITY UPLC BEH C18 with Water:ACN and 0.1% Formic Acid | 181.5 seconds | 40023050 | | RPMMFDA = Waters ACQUITY UPLC BEH C18 with Water:ACN and 0.1% Formic Acid | 189.7 seconds | 40023050 | | MTBLS87 = Merck SeQuant ZIC-pHILIC column with ACN:Water and :ammonium carbonate | 602.1 seconds | 40023050 | | KI_GIAR_zic_HILIC_pH2_7 = Merck SeQuant ZIC-HILIC with ACN:Water and 0.1% FA | 258.7 seconds | 40023050 | | Meister zic-pHILIC pH9.3 = Merck SeQuant ZIC-pHILIC column with ACN:Water 5mM NH4Ac pH9.3 and 5mM ammonium acetate in water | 244.9 seconds | 40023050 |
Predicted Kovats Retention IndicesUnderivatizedDerivatized| Derivative Name / Structure | SMILES | Kovats RI Value | Column Type | Reference |
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| Nicotinuric acid,1TMS,isomer #1 | C[Si](C)(C)OC(=O)CNC(=O)C1=CC=CN=C1 | 1886.7 | Semi standard non polar | 33892256 | | Nicotinuric acid,1TMS,isomer #2 | C[Si](C)(C)N(CC(=O)O)C(=O)C1=CC=CN=C1 | 1834.2 | Semi standard non polar | 33892256 | | Nicotinuric acid,2TMS,isomer #1 | C[Si](C)(C)OC(=O)CN(C(=O)C1=CC=CN=C1)[Si](C)(C)C | 1821.7 | Semi standard non polar | 33892256 | | Nicotinuric acid,2TMS,isomer #1 | C[Si](C)(C)OC(=O)CN(C(=O)C1=CC=CN=C1)[Si](C)(C)C | 1850.8 | Standard non polar | 33892256 | | Nicotinuric acid,2TMS,isomer #1 | C[Si](C)(C)OC(=O)CN(C(=O)C1=CC=CN=C1)[Si](C)(C)C | 2263.9 | Standard polar | 33892256 | | Nicotinuric acid,1TBDMS,isomer #1 | CC(C)(C)[Si](C)(C)OC(=O)CNC(=O)C1=CC=CN=C1 | 2137.1 | Semi standard non polar | 33892256 | | Nicotinuric acid,1TBDMS,isomer #2 | CC(C)(C)[Si](C)(C)N(CC(=O)O)C(=O)C1=CC=CN=C1 | 2069.6 | Semi standard non polar | 33892256 | | Nicotinuric acid,2TBDMS,isomer #1 | CC(C)(C)[Si](C)(C)OC(=O)CN(C(=O)C1=CC=CN=C1)[Si](C)(C)C(C)(C)C | 2287.6 | Semi standard non polar | 33892256 | | Nicotinuric acid,2TBDMS,isomer #1 | CC(C)(C)[Si](C)(C)OC(=O)CN(C(=O)C1=CC=CN=C1)[Si](C)(C)C(C)(C)C | 2243.7 | Standard non polar | 33892256 | | Nicotinuric acid,2TBDMS,isomer #1 | CC(C)(C)[Si](C)(C)OC(=O)CN(C(=O)C1=CC=CN=C1)[Si](C)(C)C(C)(C)C | 2500.9 | Standard polar | 33892256 |
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| GC-MS Spectra| Spectrum Type | Description | Splash Key | Deposition Date | Source | View |
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| Experimental GC-MS | GC-MS Spectrum - Nicotinuric acid GC-MS (2 TMS) | splash10-0a4i-3950000000-4ea0184fb844e85c5f60 | 2014-06-16 | HMDB team, MONA, MassBank | View Spectrum | | Experimental GC-MS | GC-MS Spectrum - Nicotinuric acid GC-MS (Non-derivatized) | splash10-0a4i-3950000000-4ea0184fb844e85c5f60 | 2017-09-12 | HMDB team, MONA, MassBank | View Spectrum | | Experimental GC-MS | GC-MS Spectrum - Nicotinuric acid GC-EI-TOF (Non-derivatized) | splash10-0a4i-0930000000-19848b215ab8a91b37d6 | 2017-09-12 | HMDB team, MONA, MassBank | View Spectrum | | Experimental GC-MS | GC-MS Spectrum - Nicotinuric acid GC-EI-TOF (Non-derivatized) | splash10-0a4i-0920000000-e5bc4a37c92cbe93c926 | 2017-09-12 | HMDB team, MONA, MassBank | View Spectrum | | Predicted GC-MS | Predicted GC-MS Spectrum - Nicotinuric acid GC-MS (Non-derivatized) - 70eV, Positive | splash10-0a4i-2900000000-27b6ba467f5df3c90772 | 2017-09-01 | Wishart Lab | View Spectrum | | Predicted GC-MS | Predicted GC-MS Spectrum - Nicotinuric acid GC-MS (1 TMS) - 70eV, Positive | splash10-052r-6900000000-cbc193435481d138180a | 2017-10-06 | Wishart Lab | View Spectrum | | Predicted GC-MS | Predicted GC-MS Spectrum - Nicotinuric acid GC-MS (Non-derivatized) - 70eV, Positive | Not Available | 2021-10-12 | Wishart Lab | View Spectrum | | Predicted GC-MS | Predicted GC-MS Spectrum - Nicotinuric acid GC-MS (Non-derivatized) - 70eV, Positive | Not Available | 2021-10-12 | Wishart Lab | View Spectrum |
MS/MS Spectra| Spectrum Type | Description | Splash Key | Deposition Date | Source | View |
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| Experimental LC-MS/MS | LC-MS/MS Spectrum - Nicotinuric acid Quattro_QQQ 10V, Positive-QTOF (Annotated) | splash10-001r-0900000000-28e9d6d719938b6ef2a0 | 2012-07-25 | HMDB team, MONA | View Spectrum | | Experimental LC-MS/MS | LC-MS/MS Spectrum - Nicotinuric acid Quattro_QQQ 25V, Positive-QTOF (Annotated) | splash10-0550-4900000000-4b12baba3c8ed421aab4 | 2012-07-25 | HMDB team, MONA | View Spectrum | | Experimental LC-MS/MS | LC-MS/MS Spectrum - Nicotinuric acid Quattro_QQQ 40V, Positive-QTOF (Annotated) | splash10-004i-9000000000-ca65b11ed6964f642d97 | 2012-07-25 | HMDB team, MONA | View Spectrum | | Experimental LC-MS/MS | LC-MS/MS Spectrum - Nicotinuric acid 10V, Positive-QTOF | splash10-001r-0900000000-2ea65649864830c4592d | 2021-09-20 | HMDB team, MONA | View Spectrum | | Experimental LC-MS/MS | LC-MS/MS Spectrum - Nicotinuric acid 20V, Negative-QTOF | splash10-004i-9000000000-c350dfa18b26e812ddf6 | 2021-09-20 | HMDB team, MONA | View Spectrum | | Experimental LC-MS/MS | LC-MS/MS Spectrum - Nicotinuric acid 40V, Negative-QTOF | splash10-004i-9000000000-92176234045453c39e18 | 2021-09-20 | HMDB team, MONA | View Spectrum | | Experimental LC-MS/MS | LC-MS/MS Spectrum - Nicotinuric acid 10V, Negative-QTOF | splash10-004i-9400000000-2b06c9e150d173834b2b | 2021-09-20 | HMDB team, MONA | View Spectrum | | Experimental LC-MS/MS | LC-MS/MS Spectrum - Nicotinuric acid 30V, Positive-QTOF | splash10-055r-5900000000-cbb63a133a2eca67da76 | 2021-09-20 | HMDB team, MONA | View Spectrum | | Experimental LC-MS/MS | LC-MS/MS Spectrum - Nicotinuric acid 10V, Positive-QTOF | splash10-001r-0900000000-a2d292d8b97e3068c1ca | 2021-09-20 | HMDB team, MONA | View Spectrum | | Experimental LC-MS/MS | LC-MS/MS Spectrum - Nicotinuric acid 10V, Positive-QTOF | splash10-001r-0900000000-01757174ec4bbbfe9187 | 2021-09-20 | HMDB team, MONA | View Spectrum | | Experimental LC-MS/MS | LC-MS/MS Spectrum - Nicotinuric acid 0V, Positive-QTOF | splash10-001i-0900000000-e7ce537e2a3e5805fada | 2021-09-20 | HMDB team, MONA | View Spectrum | | Experimental LC-MS/MS | LC-MS/MS Spectrum - Nicotinuric acid 10V, Negative-QTOF | splash10-004r-7900000000-974123ca1d682fc00322 | 2021-09-20 | HMDB team, MONA | View Spectrum | | Experimental LC-MS/MS | LC-MS/MS Spectrum - Nicotinuric acid 20V, Negative-QTOF | splash10-004i-9000000000-004cb59bf827d018b54c | 2021-09-20 | HMDB team, MONA | View Spectrum | | Experimental LC-MS/MS | LC-MS/MS Spectrum - Nicotinuric acid 35V, Positive-QTOF | splash10-000i-0900000000-77b3ad5bcf7e7cd59a41 | 2021-09-20 | HMDB team, MONA | View Spectrum | | Experimental LC-MS/MS | LC-MS/MS Spectrum - Nicotinuric acid 30V, Positive-QTOF | splash10-0as0-8900000000-7572e92ecd0721514f7a | 2021-09-20 | HMDB team, MONA | View Spectrum | | Experimental LC-MS/MS | LC-MS/MS Spectrum - Nicotinuric acid 30V, Negative-QTOF | splash10-004i-9000000000-42435d8b862daaa250fa | 2021-09-20 | HMDB team, MONA | View Spectrum | | Experimental LC-MS/MS | LC-MS/MS Spectrum - Nicotinuric acid 40V, Negative-QTOF | splash10-004i-9000000000-498fb0561add994d8bac | 2021-09-20 | HMDB team, MONA | View Spectrum | | Experimental LC-MS/MS | LC-MS/MS Spectrum - Nicotinuric acid 0V, Positive-QTOF | splash10-001i-0900000000-3ed1d19790df24452b11 | 2021-09-20 | HMDB team, MONA | View Spectrum | | Experimental LC-MS/MS | LC-MS/MS Spectrum - Nicotinuric acid 40V, Positive-QTOF | splash10-004i-9100000000-486a1f42c2a814cf32d5 | 2021-09-20 | HMDB team, MONA | View Spectrum | | Predicted LC-MS/MS | Predicted LC-MS/MS Spectrum - Nicotinuric acid 10V, Positive-QTOF | splash10-001i-0900000000-7691658645b49efa1218 | 2015-04-24 | Wishart Lab | View Spectrum | | Predicted LC-MS/MS | Predicted LC-MS/MS Spectrum - Nicotinuric acid 20V, Positive-QTOF | splash10-01q0-1900000000-90da23067cff9198189d | 2015-04-24 | Wishart Lab | View Spectrum | | Predicted LC-MS/MS | Predicted LC-MS/MS Spectrum - Nicotinuric acid 40V, Positive-QTOF | splash10-0kai-9400000000-b6fb3beff4d893a45c9a | 2015-04-24 | Wishart Lab | View Spectrum | | Predicted LC-MS/MS | Predicted LC-MS/MS Spectrum - Nicotinuric acid 10V, Negative-QTOF | splash10-004i-0900000000-2e3fc586dec1a239f580 | 2015-04-25 | Wishart Lab | View Spectrum | | Predicted LC-MS/MS | Predicted LC-MS/MS Spectrum - Nicotinuric acid 20V, Negative-QTOF | splash10-004i-2900000000-2e3ff3323d46a1520f5d | 2015-04-25 | Wishart Lab | View Spectrum | | Predicted LC-MS/MS | Predicted LC-MS/MS Spectrum - Nicotinuric acid 40V, Negative-QTOF | splash10-004i-9200000000-053af4d9ef684962e67b | 2015-04-25 | Wishart Lab | View Spectrum |
NMR Spectra| Spectrum Type | Description | Deposition Date | Source | View |
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| Experimental 1D NMR | 1H NMR Spectrum (1D, 500 MHz, H2O, experimental) | 2012-12-05 | Wishart Lab | View Spectrum | | Predicted 1D NMR | 13C NMR Spectrum (1D, 100 MHz, D2O, predicted) | 2021-09-25 | Wishart Lab | View Spectrum | | Predicted 1D NMR | 1H NMR Spectrum (1D, 100 MHz, D2O, predicted) | 2021-09-25 | Wishart Lab | View Spectrum | | Predicted 1D NMR | 13C NMR Spectrum (1D, 1000 MHz, D2O, predicted) | 2021-09-25 | Wishart Lab | View Spectrum | | Predicted 1D NMR | 1H NMR Spectrum (1D, 1000 MHz, D2O, predicted) | 2021-09-25 | Wishart Lab | View Spectrum | | Predicted 1D NMR | 13C NMR Spectrum (1D, 200 MHz, D2O, predicted) | 2021-09-25 | Wishart Lab | View Spectrum | | Predicted 1D NMR | 1H NMR Spectrum (1D, 200 MHz, D2O, predicted) | 2021-09-25 | Wishart Lab | View Spectrum | | Predicted 1D NMR | 13C NMR Spectrum (1D, 300 MHz, D2O, predicted) | 2021-09-25 | Wishart Lab | View Spectrum | | Predicted 1D NMR | 1H NMR Spectrum (1D, 300 MHz, D2O, predicted) | 2021-09-25 | Wishart Lab | View Spectrum | | Predicted 1D NMR | 13C NMR Spectrum (1D, 400 MHz, D2O, predicted) | 2021-09-25 | Wishart Lab | View Spectrum | | Predicted 1D NMR | 1H NMR Spectrum (1D, 400 MHz, D2O, predicted) | 2021-09-25 | Wishart Lab | View Spectrum | | Predicted 1D NMR | 13C NMR Spectrum (1D, 500 MHz, D2O, predicted) | 2021-09-25 | Wishart Lab | View Spectrum | | Predicted 1D NMR | 1H NMR Spectrum (1D, 500 MHz, D2O, predicted) | 2021-09-25 | Wishart Lab | View Spectrum | | Predicted 1D NMR | 13C NMR Spectrum (1D, 600 MHz, D2O, predicted) | 2021-09-25 | Wishart Lab | View Spectrum | | Predicted 1D NMR | 1H NMR Spectrum (1D, 600 MHz, D2O, predicted) | 2021-09-25 | Wishart Lab | View Spectrum | | Predicted 1D NMR | 13C NMR Spectrum (1D, 700 MHz, D2O, predicted) | 2021-09-25 | Wishart Lab | View Spectrum | | Predicted 1D NMR | 1H NMR Spectrum (1D, 700 MHz, D2O, predicted) | 2021-09-25 | Wishart Lab | View Spectrum | | Predicted 1D NMR | 13C NMR Spectrum (1D, 800 MHz, D2O, predicted) | 2021-09-25 | Wishart Lab | View Spectrum | | Predicted 1D NMR | 1H NMR Spectrum (1D, 800 MHz, D2O, predicted) | 2021-09-25 | Wishart Lab | View Spectrum | | Predicted 1D NMR | 13C NMR Spectrum (1D, 900 MHz, D2O, predicted) | 2021-09-25 | Wishart Lab | View Spectrum | | Predicted 1D NMR | 1H NMR Spectrum (1D, 900 MHz, D2O, predicted) | 2021-09-25 | Wishart Lab | View Spectrum | | Experimental 2D NMR | [1H, 13C]-HSQC NMR Spectrum (2D, 600 MHz, H2O, experimental) | 2012-12-05 | Wishart Lab | View Spectrum |
IR Spectra| Spectrum Type | Description | Deposition Date | Source | View |
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| Predicted IR Spectrum | IR Ion Spectrum (Predicted IRIS Spectrum, Adduct: [M-H]-) | 2023-02-03 | FELIX lab | View Spectrum | | Predicted IR Spectrum | IR Ion Spectrum (Predicted IRIS Spectrum, Adduct: [M+H]+) | 2023-02-03 | FELIX lab | View Spectrum | | Predicted IR Spectrum | IR Ion Spectrum (Predicted IRIS Spectrum, Adduct: [M+Na]+) | 2023-02-03 | FELIX lab | View Spectrum |
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| General References | - Hengen N, Seiberth V, Hengen M: High-performance liquid-chromatographic determination of free nicotinic acid and its metabolite, nicotinuric acid, in plasma and urine. Clin Chem. 1978 Oct;24(10):1740-3. [PubMed:699281 ]
- Miyauchi Y, Sano N, Nakamura T: Simultaneous determination of nicotinic acid and its two metabolites in human plasma using solid-phase extraction in combination with high performance liquid chromatography. Int J Vitam Nutr Res. 1993;63(2):145-9. [PubMed:8407165 ]
- Neuvonen PJ, Roivas L, Laine K, Sundholm O: The bioavailability of sustained release nicotinic acid formulations. Br J Clin Pharmacol. 1991 Oct;32(4):473-6. [PubMed:1958442 ]
- Figge HL, Figge J, Souney PF, Sacks FM, Shargel L, Janosik JE, Kaul AF: Comparison of excretion of nicotinuric acid after ingestion of two controlled release nicotinic acid preparations in man. J Clin Pharmacol. 1988 Dec;28(12):1136-40. [PubMed:3243933 ]
- Dieterle F, Ross A, Schlotterbeck G, Senn H: Metabolite projection analysis for fast identification of metabolites in metabonomics. Application in an amiodarone study. Anal Chem. 2006 Jun 1;78(11):3551-61. [PubMed:16737207 ]
- Pfuhl P, Karcher U, Haring N, Baumeister A, Tawab MA, Schubert-Zsilavecz M: Simultaneous determination of niacin, niacinamide and nicotinuric acid in human plasma. J Pharm Biomed Anal. 2005 Jan 4;36(5):1045-52. [PubMed:15620531 ]
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