The chemical Vitamin D3 has a designated molecular formula of C27H44O and a molecular weight of 384.648 g/mol. Synonyms may include: Cholecalciferol, Activated 7-dehydrocholesterol, Arachitol, Calciol, CC, CCRIS 6286, D3, Cholecalciferolum, Colecalciferol, Colecalciferolo [DCIT], Colecalciferolum [INN-Latin] (ChemID).