Cholecalciferol EP Impurity B Catalogue D546402 CAS 434-16-2 M.W 384.65 M.F C27H44O Specifications FAQs Synonyms:(3S,9S,10R,13R,14R,17R)-10,13-dimethyl-17-((R)-6-methylheptan-2-yl)-2,3,4,9,10,11,12,13,14,15,16,17-dodecahydro-1H-cyclopenta[a]phenanthren-3-ol