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Record Information
Version5.0
StatusExpected but not Quantified
Creation Date2013-06-12 17:32:28 UTC
Update Date2021-09-14 14:57:30 UTC
HMDB IDHMDB0060534
Secondary Accession Numbers
  • HMDB60534
Metabolite Identification
Common NameDesmethylazelastine
DescriptionDesmethylazelastine belongs to the class of organic compounds known as phthalazinones. Phthalazinones are compounds containing a phthalazine bearing a ketone group. Desmethylazelastine is a metabolite of Azelastine. Desmethylazelastine is a very strong basic compound (based on its pKa). Azelastine N-demethylation in humans liver microsomes is catalyzed mainly by CYP3A4 and CYP2D6, and CYP1A2 to a small extent (in average, 76.6, 21.8, and 3.9%, respectively. Azelastine, an antiallergy and antiasthmatic drug, has been reported to be mainly N-demethylated to desmethylazelastine in humans.
Structure
Data?1563866072
Synonyms
ValueSource
4-(4-Chlorobenzyl)-2-(perhydroazepinyl-(4))-1(2H)-phthala zinoneHMDB
Desmethylazelastine hydrobromideHMDB
Chemical FormulaC21H22ClN3O
Average Molecular Weight367.872
Monoisotopic Molecular Weight367.145140048
IUPAC Name2-(azepan-4-yl)-4-[(4-chlorophenyl)methyl]-1,2-dihydrophthalazin-1-one
Traditional Name2-(azepan-4-yl)-4-[(4-chlorophenyl)methyl]phthalazin-1-one
CAS Registry NumberNot Available
SMILES
ClC1=CC=C(CC2=NN(C3CCCNCC3)C(=O)C3=CC=CC=C23)C=C1
InChI Identifier
InChI=1S/C21H22ClN3O/c22-16-9-7-15(8-10-16)14-20-18-5-1-2-6-19(18)21(26)25(24-20)17-4-3-12-23-13-11-17/h1-2,5-10,17,23H,3-4,11-14H2
InChI KeyWRYCMIFVXDQIKN-UHFFFAOYSA-N
Chemical Taxonomy
Description Belongs to the class of organic compounds known as phthalazinones. Phthalazinones are compounds containing a phthalazine bearing a ketone group.
KingdomOrganic compounds
Super ClassOrganoheterocyclic compounds
ClassDiazanaphthalenes
Sub ClassBenzodiazines
Direct ParentPhthalazinones
Alternative Parents
Substituents
  • Phthalazinone
  • Azepane
  • Chlorobenzene
  • Halobenzene
  • Pyridazinone
  • Aryl chloride
  • Aryl halide
  • Monocyclic benzene moiety
  • Benzenoid
  • Pyridazine
  • Heteroaromatic compound
  • Lactam
  • Secondary aliphatic amine
  • Azacycle
  • Secondary amine
  • Organohalogen compound
  • Organic nitrogen compound
  • Amine
  • Hydrocarbon derivative
  • Organic oxide
  • Organopnictogen compound
  • Organic oxygen compound
  • Organochloride
  • Organonitrogen compound
  • Organooxygen compound
  • Aromatic heteropolycyclic compound
Molecular FrameworkAromatic heteropolycyclic compounds
External DescriptorsNot Available
Ontology
Physiological effectNot Available
Disposition
ProcessNot Available
RoleNot Available
Physical Properties
StateNot Available
Experimental Molecular Properties
PropertyValueReference
Melting PointNot AvailableNot Available
Boiling PointNot AvailableNot Available
Water SolubilityNot AvailableNot Available
LogPNot AvailableNot Available
Experimental Chromatographic PropertiesNot Available
Predicted Molecular Properties
PropertyValueSource
Water Solubility0.01 g/LALOGPS
logP3.25ALOGPS
logP3.66ChemAxon
logS-4.6ALOGPS
pKa (Strongest Basic)10.37ChemAxon
Physiological Charge1ChemAxon
Hydrogen Acceptor Count3ChemAxon
Hydrogen Donor Count1ChemAxon
Polar Surface Area44.7 ŲChemAxon
Rotatable Bond Count3ChemAxon
Refractivity105.22 m³·mol⁻¹ChemAxon
Polarizability39.6 ųChemAxon
Number of Rings4ChemAxon
BioavailabilityYesChemAxon
Rule of FiveYesChemAxon
Ghose FilterYesChemAxon
Veber's RuleNoChemAxon
MDDR-like RuleNoChemAxon
Predicted Chromatographic Properties

Predicted Collision Cross Sections

PredictorAdduct TypeCCS Value (Å2)Reference
DeepCCS[M-2H]-220.32330932474
DeepCCS[M+Na]+196.25930932474
AllCCS[M+H]+187.532859911
AllCCS[M+H-H2O]+184.632859911
AllCCS[M+NH4]+190.232859911
AllCCS[M+Na]+190.932859911
AllCCS[M-H]-190.632859911
AllCCS[M+Na-2H]-190.532859911
AllCCS[M+HCOO]-190.532859911

Predicted Kovats Retention Indices

Underivatized

MetaboliteSMILESKovats RI ValueColumn TypeReference
DesmethylazelastineClC1=CC=C(CC2=NN(C3CCCNCC3)C(=O)C3=CC=CC=C23)C=C14285.2Standard polar33892256
DesmethylazelastineClC1=CC=C(CC2=NN(C3CCCNCC3)C(=O)C3=CC=CC=C23)C=C13197.7Standard non polar33892256
DesmethylazelastineClC1=CC=C(CC2=NN(C3CCCNCC3)C(=O)C3=CC=CC=C23)C=C13357.7Semi standard non polar33892256

Derivatized

Derivative Name / StructureSMILESKovats RI ValueColumn TypeReference
Desmethylazelastine,1TMS,isomer #1C[Si](C)(C)N1CCCC(N2N=C(CC3=CC=C(Cl)C=C3)C3=CC=CC=C3C2=O)CC13446.3Semi standard non polar33892256
Desmethylazelastine,1TMS,isomer #1C[Si](C)(C)N1CCCC(N2N=C(CC3=CC=C(Cl)C=C3)C3=CC=CC=C3C2=O)CC13235.0Standard non polar33892256
Desmethylazelastine,1TMS,isomer #1C[Si](C)(C)N1CCCC(N2N=C(CC3=CC=C(Cl)C=C3)C3=CC=CC=C3C2=O)CC14264.1Standard polar33892256
Desmethylazelastine,1TBDMS,isomer #1CC(C)(C)[Si](C)(C)N1CCCC(N2N=C(CC3=CC=C(Cl)C=C3)C3=CC=CC=C3C2=O)CC13686.9Semi standard non polar33892256
Desmethylazelastine,1TBDMS,isomer #1CC(C)(C)[Si](C)(C)N1CCCC(N2N=C(CC3=CC=C(Cl)C=C3)C3=CC=CC=C3C2=O)CC13431.5Standard non polar33892256
Desmethylazelastine,1TBDMS,isomer #1CC(C)(C)[Si](C)(C)N1CCCC(N2N=C(CC3=CC=C(Cl)C=C3)C3=CC=CC=C3C2=O)CC14386.4Standard polar33892256
Spectra

GC-MS Spectra

Spectrum TypeDescriptionSplash KeyDeposition DateSourceView
Predicted GC-MSPredicted GC-MS Spectrum - Desmethylazelastine GC-MS (Non-derivatized) - 70eV, Positivesplash10-0002-9352000000-9747b61b1bcac506ff802017-09-20Wishart LabView Spectrum
Predicted GC-MSPredicted GC-MS Spectrum - Desmethylazelastine GC-MS (Non-derivatized) - 70eV, PositiveNot Available2021-10-12Wishart LabView Spectrum
Predicted GC-MSPredicted GC-MS Spectrum - Desmethylazelastine GC-MS (Non-derivatized) - 70eV, PositiveNot Available2021-10-12Wishart LabView Spectrum

MS/MS Spectra

Spectrum TypeDescriptionSplash KeyDeposition DateSourceView
Predicted LC-MS/MSPredicted LC-MS/MS Spectrum - Desmethylazelastine 10V, Positive-QTOFsplash10-014i-0019000000-6219d0f9716d2096c5112016-08-03Wishart LabView Spectrum
Predicted LC-MS/MSPredicted LC-MS/MS Spectrum - Desmethylazelastine 20V, Positive-QTOFsplash10-014l-4069000000-7121f0f66d54ee277a7a2016-08-03Wishart LabView Spectrum
Predicted LC-MS/MSPredicted LC-MS/MS Spectrum - Desmethylazelastine 40V, Positive-QTOFsplash10-052e-9110000000-51890a7242802275cbd92016-08-03Wishart LabView Spectrum
Predicted LC-MS/MSPredicted LC-MS/MS Spectrum - Desmethylazelastine 10V, Negative-QTOFsplash10-014i-0019000000-c5670a14bce0763c5cf52016-08-03Wishart LabView Spectrum
Predicted LC-MS/MSPredicted LC-MS/MS Spectrum - Desmethylazelastine 20V, Negative-QTOFsplash10-014i-1159000000-b306171246152d95ce4d2016-08-03Wishart LabView Spectrum
Predicted LC-MS/MSPredicted LC-MS/MS Spectrum - Desmethylazelastine 40V, Negative-QTOFsplash10-014i-2190000000-72823a7e766ec67168cb2016-08-03Wishart LabView Spectrum
Predicted LC-MS/MSPredicted LC-MS/MS Spectrum - Desmethylazelastine 10V, Positive-QTOFsplash10-014i-0009000000-0511774b14bf8182a1932021-10-12Wishart LabView Spectrum
Predicted LC-MS/MSPredicted LC-MS/MS Spectrum - Desmethylazelastine 20V, Positive-QTOFsplash10-014i-0019000000-161442246dc19b21d97e2021-10-12Wishart LabView Spectrum
Predicted LC-MS/MSPredicted LC-MS/MS Spectrum - Desmethylazelastine 40V, Positive-QTOFsplash10-054k-9432000000-84cb52524ff08770a3ad2021-10-12Wishart LabView Spectrum
Predicted LC-MS/MSPredicted LC-MS/MS Spectrum - Desmethylazelastine 10V, Negative-QTOFsplash10-014i-0009000000-5826527ea80f1a2cb74d2021-10-12Wishart LabView Spectrum
Predicted LC-MS/MSPredicted LC-MS/MS Spectrum - Desmethylazelastine 20V, Negative-QTOFsplash10-014i-0359000000-9bd1b7ba64b43c7dfdf82021-10-12Wishart LabView Spectrum
Predicted LC-MS/MSPredicted LC-MS/MS Spectrum - Desmethylazelastine 40V, Negative-QTOFsplash10-053r-8891000000-23ae97f8da34e69f21a52021-10-12Wishart LabView Spectrum
Biological Properties
Cellular Locations
  • Cytoplasm
  • Membrane (predicted from logP)
Biospecimen Locations
  • Blood
  • Urine
Tissue Locations
  • Kidney
  • Liver
Pathways
Normal Concentrations
BiospecimenStatusValueAgeSexConditionReferenceDetails
BloodExpected but not QuantifiedNot QuantifiedNot AvailableNot AvailableNormal
      Not Available
details
UrineExpected but not QuantifiedNot QuantifiedNot AvailableNot AvailableNormal
      Not Available
details
Abnormal Concentrations
Not Available
Associated Disorders and Diseases
Disease ReferencesNone
Associated OMIM IDsNone
DrugBank IDNot Available
Phenol Explorer Compound IDNot Available
FooDB IDNot Available
KNApSAcK IDNot Available
Chemspider IDNot Available
KEGG Compound IDNot Available
BioCyc IDNot Available
BiGG IDNot Available
Wikipedia LinkNot Available
METLIN IDNot Available
PubChem Compound162558
PDB IDNot Available
ChEBI IDNot Available
Food Biomarker OntologyNot Available
VMH IDNot Available
MarkerDB IDNot Available
Good Scents IDNot Available
References
Synthesis ReferenceNot Available
Material Safety Data Sheet (MSDS)Not Available
General References
  1. Nakajima M, Nakamura S, Tokudome S, Shimada N, Yamazaki H, Yokoi T: Azelastine N-demethylation by cytochrome P-450 (CYP)3A4, CYP2D6, and CYP1A2 in human liver microsomes: evaluation of approach to predict the contribution of multiple CYPs. Drug Metab Dispos. 1999 Dec;27(12):1381-91. [PubMed:10570018 ]