| Record Information |
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| Version | 5.0 |
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| Status | Expected but not Quantified |
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| Creation Date | 2012-09-06 15:16:49 UTC |
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| Update Date | 2022-03-07 02:51:37 UTC |
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| HMDB ID | HMDB0014428 |
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| Secondary Accession Numbers | |
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| Metabolite Identification |
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| Common Name | Clemastine |
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| Description | Clemastine is only found in individuals that have used or taken this drug. It is an ethanolamine-derivative, first generation histamine H1 antagonist used in hay fever, rhinitis, allergic skin conditions, and pruritus. It causes drowsiness. [PubChem]Clemastine is a selective histamine H1 antagonist and binds to the histamine H1 receptor. This blocks the action of endogenous histamine, which subsequently leads to temporary relief of the negative symptoms brought on by histamine. |
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| Structure | CN1CCC[C@@H]1CCO[C@](C)(C1=CC=CC=C1)C1=CC=C(Cl)C=C1 InChI=1S/C21H26ClNO/c1-21(17-7-4-3-5-8-17,18-10-12-19(22)13-11-18)24-16-14-20-9-6-15-23(20)2/h3-5,7-8,10-13,20H,6,9,14-16H2,1-2H3/t20-,21-/m1/s1 |
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| Synonyms | | Value | Source |
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| (+)-(2R)-2-(2-(((R)-p-Chloro-alpha-methyl-alpha-phenylbenzyl)oxy)ethyl)-1-methylpyrrolidine | ChEBI | | (+)-(2R)-2-[2-[[(R)-p-Chloro-alpha-methyl-alpha-phenylbenzyl]oxy]ethyl]-1-methylpyrrolidine | ChEBI | | Clemastina | ChEBI | | Clemastinum | ChEBI | | (+)-(2R)-2-(2-(((R)-p-Chloro-a-methyl-a-phenylbenzyl)oxy)ethyl)-1-methylpyrrolidine | Generator | | (+)-(2R)-2-(2-(((R)-p-Chloro-α-methyl-α-phenylbenzyl)oxy)ethyl)-1-methylpyrrolidine | Generator | | (+)-(2R)-2-[2-[[(R)-p-Chloro-a-methyl-a-phenylbenzyl]oxy]ethyl]-1-methylpyrrolidine | Generator | | (+)-(2R)-2-[2-[[(R)-p-Chloro-α-methyl-α-phenylbenzyl]oxy]ethyl]-1-methylpyrrolidine | Generator | | Clemastine fumarate | HMDB | | Tavist | HMDB | | Tavegyl | HMDB | | 2-(2-(1-(4-Chlorophenyl)-1-phenylethoxy)ethyl)-1-methylpyrrolidine | HMDB | | Meclastine | HMDB | | Mecloprodin | HMDB |
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| Chemical Formula | C21H26ClNO |
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| Average Molecular Weight | 343.89 |
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| Monoisotopic Molecular Weight | 343.170292166 |
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| IUPAC Name | (2R)-2-{2-[(1R)-1-(4-chlorophenyl)-1-phenylethoxy]ethyl}-1-methylpyrrolidine |
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| Traditional Name | clemastine |
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| CAS Registry Number | 15686-51-8 |
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| SMILES | CN1CCC[C@@H]1CCO[C@](C)(C1=CC=CC=C1)C1=CC=C(Cl)C=C1 |
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| InChI Identifier | InChI=1S/C21H26ClNO/c1-21(17-7-4-3-5-8-17,18-10-12-19(22)13-11-18)24-16-14-20-9-6-15-23(20)2/h3-5,7-8,10-13,20H,6,9,14-16H2,1-2H3/t20-,21-/m1/s1 |
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| InChI Key | YNNUSGIPVFPVBX-NHCUHLMSSA-N |
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| Chemical Taxonomy |
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| Description | Belongs to the class of organic compounds known as diphenylmethanes. Diphenylmethanes are compounds containing a diphenylmethane moiety, which consists of a methane wherein two hydrogen atoms are replaced by two phenyl groups. |
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| Kingdom | Organic compounds |
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| Super Class | Benzenoids |
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| Class | Benzene and substituted derivatives |
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| Sub Class | Diphenylmethanes |
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| Direct Parent | Diphenylmethanes |
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| Alternative Parents | |
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| Substituents | - Diphenylmethane
- Benzylether
- Chlorobenzene
- Halobenzene
- Aryl chloride
- Aryl halide
- N-alkylpyrrolidine
- Pyrrolidine
- Tertiary aliphatic amine
- Tertiary amine
- Dialkyl ether
- Azacycle
- Ether
- Organoheterocyclic compound
- Organic oxygen compound
- Organic nitrogen compound
- Amine
- Hydrocarbon derivative
- Organopnictogen compound
- Organohalogen compound
- Organochloride
- Organonitrogen compound
- Organooxygen compound
- 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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| Not Available | 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 | 178 °C (hydrogen fumarate formulation) | Not Available | | Boiling Point | Not Available | Not Available | | Water Solubility | 0.0004 g/L | Not Available | | LogP | 5.2 | 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 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. | 8.34 minutes | 32390414 | | Predicted by Siyang on May 30, 2022 | 12.3258 minutes | 33406817 | | Predicted by Siyang using ReTip algorithm on June 8, 2022 | 2.1 minutes | 32390414 | | AjsUoB = Accucore 150 Amide HILIC with 10mM Ammonium Formate, 0.1% Formic Acid | 48.9 seconds | 40023050 | | Fem_Long = Waters ACQUITY UPLC HSS T3 C18 with Water:MeOH and 0.1% Formic Acid | 1716.8 seconds | 40023050 | | Fem_Lipids = Ascentis Express C18 with (60:40 water:ACN):(90:10 IPA:ACN) and 10mM NH4COOH + 0.1% Formic Acid | 248.8 seconds | 40023050 | | Life_Old = Waters ACQUITY UPLC BEH C18 with Water:(20:80 acetone:ACN) and 0.1% Formic Acid | 199.9 seconds | 40023050 | | Life_New = RP Waters ACQUITY UPLC HSS T3 C18 with Water:(30:70 MeOH:ACN) and 0.1% Formic Acid | 188.2 seconds | 40023050 | | RIKEN = Waters ACQUITY UPLC BEH C18 with Water:ACN and 0.1% Formic Acid | 127.1 seconds | 40023050 | | Eawag_XBridgeC18 = XBridge C18 3.5u 2.1x50 mm with Water:MeOH and 0.1% Formic Acid | 525.5 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 | 509.8 seconds | 40023050 | | HILIC_BDD_2 = Merck SeQuant ZIC-HILIC with ACN(0.1% formic acid):water(16 mM ammonium formate) | 389.7 seconds | 40023050 | | UniToyama_Atlantis = RP Waters Atlantis T3 (2.1 x 150 mm, 5 um) with ACN:Water and 0.1% Formic Acid | 1130.1 seconds | 40023050 | | BDD_C18 = Hypersil Gold 1.9µm C18 with Water:ACN and 0.1% Formic Acid | 463.1 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 | 1248.7 seconds | 40023050 | | SNU_RIKEN_POS = Waters ACQUITY UPLC BEH C18 with Water:ACN and 0.1% Formic Acid | 277.6 seconds | 40023050 | | RPMMFDA = Waters ACQUITY UPLC BEH C18 with Water:ACN and 0.1% Formic Acid | 357.8 seconds | 40023050 | | MTBLS87 = Merck SeQuant ZIC-pHILIC column with ACN:Water and :ammonium carbonate | 305.8 seconds | 40023050 | | KI_GIAR_zic_HILIC_pH2_7 = Merck SeQuant ZIC-HILIC with ACN:Water and 0.1% FA | 257.4 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 | 7.8 seconds | 40023050 |
Predicted Kovats Retention IndicesUnderivatized |
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| GC-MS Spectra| Spectrum Type | Description | Splash Key | Deposition Date | Source | View |
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| Predicted GC-MS | Predicted GC-MS Spectrum - Clemastine GC-MS (Non-derivatized) - 70eV, Positive | splash10-0159-9381000000-2be9b3484b69dbb1ec63 | 2017-09-01 | Wishart Lab | View Spectrum | | Predicted GC-MS | Predicted GC-MS Spectrum - Clemastine GC-MS (Non-derivatized) - 70eV, Positive | Not Available | 2021-10-12 | Wishart Lab | View Spectrum | | Predicted GC-MS | Predicted GC-MS Spectrum - Clemastine 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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| Predicted LC-MS/MS | Predicted LC-MS/MS Spectrum - Clemastine 10V, Positive-QTOF | splash10-0006-0219000000-53f17c8ceacb47bd5078 | 2016-08-02 | Wishart Lab | View Spectrum | | Predicted LC-MS/MS | Predicted LC-MS/MS Spectrum - Clemastine 20V, Positive-QTOF | splash10-01q9-9654000000-256b7783ad5643c033a0 | 2016-08-02 | Wishart Lab | View Spectrum | | Predicted LC-MS/MS | Predicted LC-MS/MS Spectrum - Clemastine 40V, Positive-QTOF | splash10-0159-9230000000-a33cd510091ea6d3b4a2 | 2016-08-02 | Wishart Lab | View Spectrum | | Predicted LC-MS/MS | Predicted LC-MS/MS Spectrum - Clemastine 10V, Negative-QTOF | splash10-0006-0049000000-3acb1542ee1bb658496b | 2016-08-03 | Wishart Lab | View Spectrum | | Predicted LC-MS/MS | Predicted LC-MS/MS Spectrum - Clemastine 20V, Negative-QTOF | splash10-001l-1396000000-5c34f94642de71cce41b | 2016-08-03 | Wishart Lab | View Spectrum | | Predicted LC-MS/MS | Predicted LC-MS/MS Spectrum - Clemastine 40V, Negative-QTOF | splash10-0159-4970000000-3e174d2a679bb5d9d1a8 | 2016-08-03 | Wishart Lab | View Spectrum | | Predicted LC-MS/MS | Predicted LC-MS/MS Spectrum - Clemastine 10V, Positive-QTOF | splash10-014i-0292000000-dabaff00449bbd64c5d2 | 2021-09-23 | Wishart Lab | View Spectrum | | Predicted LC-MS/MS | Predicted LC-MS/MS Spectrum - Clemastine 20V, Positive-QTOF | splash10-014i-0490000000-03484546c277f858fe09 | 2021-09-23 | Wishart Lab | View Spectrum | | Predicted LC-MS/MS | Predicted LC-MS/MS Spectrum - Clemastine 40V, Positive-QTOF | splash10-017r-1940000000-1f12fcabbb87d6d6bb38 | 2021-09-23 | Wishart Lab | View Spectrum | | Predicted LC-MS/MS | Predicted LC-MS/MS Spectrum - Clemastine 10V, Negative-QTOF | splash10-0006-0069000000-e82fab8cc80ce105c0c8 | 2021-09-24 | Wishart Lab | View Spectrum | | Predicted LC-MS/MS | Predicted LC-MS/MS Spectrum - Clemastine 20V, Negative-QTOF | splash10-0uy3-2921000000-3f8372d3f78db3aa22f3 | 2021-09-24 | Wishart Lab | View Spectrum | | Predicted LC-MS/MS | Predicted LC-MS/MS Spectrum - Clemastine 40V, Negative-QTOF | splash10-02ti-3970000000-54df7e5483a544588256 | 2021-09-24 | Wishart Lab | View Spectrum |
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| General References | - Hayashi H, Okajima M, Yamada K: Atrial T (Ta) loop in dogs with or without atrial injury. Am Heart J. 1976 May;91(5):607-17. [PubMed:1266718 ]
- Schran HF, Petryk L, Chang CT, O'Connor R, Gelbert MB: The pharmacokinetics and bioavailability of clemastine and phenylpropanolamine in single-component and combination formulations. J Clin Pharmacol. 1996 Oct;36(10):911-22. [PubMed:8930778 ]
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