Cholecalciferol Impurity C,(3S,9R,10S,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,Lumisterol3 is an isomer of Vitamin D3 . Lumisterol3 is used in the preparation of vitamin D analogs.,Cholecalciferol