Record Information |
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Version | 5.0 |
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Status | Expected but not Quantified |
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Creation Date | 2013-07-09 16:08:52 UTC |
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Update Date | 2023-02-21 17:30:16 UTC |
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HMDB ID | HMDB0060946 |
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Secondary Accession Numbers | |
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Metabolite Identification |
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Common Name | NAPQI |
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Description | NAPQI, also known as acetimidoquinone or NABQ, belongs to the class of organic compounds known as secondary ketimines. These are ketimines where the nitrogen of the ketimine group is linked to an alkyl or aryl group. NAPQI is an extremely weak basic (essentially neutral) compound (based on its pKa). Within humans, NAPQI participates in a number of enzymatic reactions. In particular, NAPQI can be biosynthesized from acetaminophen through the action of the enzymes cytochrome P450 2E1, cytochrome P450 1A2, cytochrome P450 2D6, cytochrome P450 3A4, and cytochrome P450 2A6. In addition, NAPQI and glutathione can be converted into acetaminophen cystein; which is mediated by the enzymes glutathione S-transferase p and glutathione S-transferase theta-1. In humans, NAPQI is involved in acetaminophen metabolism pathway. It is normally produced only in small amounts, and then almost immediately detoxified in the liver. NAPQI is a metabolite of acetaminophen. NAPQI (N-acetyl-p-benzoquinone imine) is a toxic byproduct produced during the xenobiotic metabolism of the analgesic paracetamol (acetaminophen). However, under some conditions in which NAPQI is not effectively detoxified (usually in case of paracetamol overdose), it causes severe damage to the liver. |
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Structure | InChI=1S/C8H7NO2/c1-6(10)9-7-2-4-8(11)5-3-7/h2-5H,1H3 |
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Synonyms | Value | Source |
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4-Acetylimino-2,5-cyclohexadien-1-one | ChEBI | Acetimidoquinone | ChEBI | N-Acetyl-4-benzoquinoneimine | ChEBI | N-Acetyl-p-benzoquinone imine | ChEBI | N-Acetylbenzoquinoneimine | ChEBI | N-Acetyl-4-benzoquinone imine | HMDB | N-Acetyl-4-benzoquinoneimine, 3,5-(14)C-labeled CPD | HMDB | N-Acetyl-p-benzoquinoneimine | HMDB | NABQ | HMDB |
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Chemical Formula | C8H7NO2 |
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Average Molecular Weight | 149.1467 |
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Monoisotopic Molecular Weight | 149.047678473 |
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IUPAC Name | N-(4-oxocyclohexa-2,5-dien-1-ylidene)acetamide |
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Traditional Name | N-acetyl-p-benzoquinone |
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CAS Registry Number | Not Available |
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SMILES | CC(=O)N=C1C=CC(=O)C=C1 |
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InChI Identifier | InChI=1S/C8H7NO2/c1-6(10)9-7-2-4-8(11)5-3-7/h2-5H,1H3 |
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InChI Key | URNSECGXFRDEDC-UHFFFAOYSA-N |
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Chemical Taxonomy |
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Description | Belongs to the class of organic compounds known as secondary ketimines. These are ketimines where the nitrogen of the ketimine group is linked to an alkyl or aryl group. |
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Kingdom | Organic compounds |
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Super Class | Organic nitrogen compounds |
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Class | Organonitrogen compounds |
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Sub Class | Imines |
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Direct Parent | Secondary ketimines |
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Alternative Parents | |
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Substituents | - Secondary ketimine
- Azomethine
- Cyclic ketone
- N-acylimine
- Ketone
- Organic 1,3-dipolar compound
- Propargyl-type 1,3-dipolar organic compound
- Carboxylic acid derivative
- Organic oxygen compound
- Organopnictogen compound
- Organic oxide
- Hydrocarbon derivative
- Organooxygen compound
- Carbonyl group
- Aliphatic homomonocyclic compound
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Molecular Framework | Aliphatic homomonocyclic 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 | |
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Role | Not Available |
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Physical Properties |
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State | Not Available |
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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 | Not Available |
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Predicted Molecular Properties | |
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Predicted Chromatographic Properties | Predicted Collision Cross SectionsPredicted Kovats Retention IndicesUnderivatized |
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| GC-MS SpectraSpectrum Type | Description | Splash Key | Deposition Date | Source | View |
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Predicted GC-MS | Predicted GC-MS Spectrum - NAPQI GC-MS (Non-derivatized) - 70eV, Positive | splash10-0006-9500000000-26d4378e16051e29f3a0 | 2017-09-20 | Wishart Lab | View Spectrum | Predicted GC-MS | Predicted GC-MS Spectrum - NAPQI GC-MS (Non-derivatized) - 70eV, Positive | Not Available | 2021-10-12 | Wishart Lab | View Spectrum | Predicted GC-MS | Predicted GC-MS Spectrum - NAPQI GC-MS (Non-derivatized) - 70eV, Positive | Not Available | 2021-10-12 | Wishart Lab | View Spectrum |
MS/MS SpectraSpectrum Type | Description | Splash Key | Deposition Date | Source | View |
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Predicted LC-MS/MS | Predicted LC-MS/MS Spectrum - NAPQI 10V, Positive-QTOF | splash10-0udi-0900000000-ac4176497e66953d40c0 | 2017-10-06 | Wishart Lab | View Spectrum | Predicted LC-MS/MS | Predicted LC-MS/MS Spectrum - NAPQI 20V, Positive-QTOF | splash10-0pb9-0900000000-742d4824d6c715e26f22 | 2017-10-06 | Wishart Lab | View Spectrum | Predicted LC-MS/MS | Predicted LC-MS/MS Spectrum - NAPQI 40V, Positive-QTOF | splash10-002f-9000000000-6e485c18c7bf55922b57 | 2017-10-06 | Wishart Lab | View Spectrum | Predicted LC-MS/MS | Predicted LC-MS/MS Spectrum - NAPQI 10V, Negative-QTOF | splash10-0002-0900000000-2a0e88975df639fa0154 | 2017-10-06 | Wishart Lab | View Spectrum | Predicted LC-MS/MS | Predicted LC-MS/MS Spectrum - NAPQI 20V, Negative-QTOF | splash10-0a4j-0900000000-d205478121975decd1e6 | 2017-10-06 | Wishart Lab | View Spectrum | Predicted LC-MS/MS | Predicted LC-MS/MS Spectrum - NAPQI 40V, Negative-QTOF | splash10-0a4i-5900000000-069af19709609ef10b8d | 2017-10-06 | Wishart Lab | View Spectrum | Predicted LC-MS/MS | Predicted LC-MS/MS Spectrum - NAPQI 10V, Positive-QTOF | splash10-0zfr-0900000000-7770a7a758395a5aeeee | 2021-10-12 | Wishart Lab | View Spectrum | Predicted LC-MS/MS | Predicted LC-MS/MS Spectrum - NAPQI 20V, Positive-QTOF | splash10-0a59-4900000000-c817f1a34bce822d981d | 2021-10-12 | Wishart Lab | View Spectrum | Predicted LC-MS/MS | Predicted LC-MS/MS Spectrum - NAPQI 40V, Positive-QTOF | splash10-0a59-9500000000-1dabf7d69b9d1c225114 | 2021-10-12 | Wishart Lab | View Spectrum | Predicted LC-MS/MS | Predicted LC-MS/MS Spectrum - NAPQI 10V, Negative-QTOF | splash10-0002-0900000000-d32a0a3b410ab4200586 | 2021-10-12 | Wishart Lab | View Spectrum | Predicted LC-MS/MS | Predicted LC-MS/MS Spectrum - NAPQI 20V, Negative-QTOF | splash10-0002-0900000000-017594813fe14d2bf2a9 | 2021-10-12 | Wishart Lab | View Spectrum | Predicted LC-MS/MS | Predicted LC-MS/MS Spectrum - NAPQI 40V, Negative-QTOF | splash10-056r-9500000000-376138408404ae9cf517 | 2021-10-12 | Wishart Lab | View Spectrum |
IR SpectraSpectrum Type | Description | Deposition Date | Source | View |
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Predicted IR Spectrum | IR Ion Spectrum (Predicted IRIS Spectrum, Adduct: [M+H]+) | 2023-02-04 | FELIX lab | View Spectrum | Predicted IR Spectrum | IR Ion Spectrum (Predicted IRIS Spectrum, Adduct: [M+Na]+) | 2023-02-04 | FELIX lab | View Spectrum |
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