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73837-24-8Calcitriol EP Impurity A

● Under Development

Catalogue No.:	VE006889
CAS No.:	73837-24-8
Mol. Formula:	C27H44O3
Mol. Weight:	416.64 g/mol

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Additional information on CAS 73837-24-8

Parent drug

Calcitriol

IUPAC Name

(5E,7E)-9,10-Secocholesta-5,7,10(19)-triene-1α,3β,25-triol

Smiles

C=C1[C@](O)([H])C[C@]([H])(O)C/C1=C\C=C2[C@@](CC[C@]3([H])[C@@](C)([H])CCCC(O)(C)C)([H])[C@]3(C)CCC\2

InChI

InChI=1S/C27H44O3/c1-18(8-6-14-26(3,4)30)23-12-13-24-20(9-7-15-27(23,24)5)10-11-21-16-22(28)17-25(29)19(21)2/h10-11,18,22-25,28-30H,2,6-9,12-17H2,1,3-5H3/b20-10+,21-11+/t18-,22-,23-,24+,25+,27-/m1/s1

Synonyms

Trans-Calcitriol

Description

Calcitriol EP Impurity A, identified as trans-calcitriol, is a stereoisomeric impurity of the secosteroid vitamin D3 metabolite family rather than a degradant of unrelated chemotypes. The all-trans geometry at the triene system can arise during photochemical or thermal isomerization of calcitriol, with potential enrichment during synthesis, storage, or exposure to light. Its molecular formula is C27H44O3 and molecular weight 416.6, corresponding to CAS 73837-24-8. Because positional and geometric isomers may exhibit closely related UV responses, definitive characterization typically requires LC-MS/MS with chiral or high-resolution reversed-phase separation, often complemented by NMR and, where needed, GC-MS after derivatization.