Calcitriol EP Impurity C; pre-Calcitriol Triazoline Adduct; pre-Calcitriol PTAD Adduct (Mixture of Diastereomers),(6aR,7R,9aR)-11-[(3S,5R)-3,5-Dihydroxy-2-methylcyclohex-1-enyl]-7-[(1R)-5-hydroxy-1,5-dimethylhexyl]-6a-methyl-2-phenyl-5,6,6a,7,8,9,9a,11-octahydro-1H,4aH-cyclopenta[f][1,2,4]triazolo[1,2-a]cinnoline-1,3(2H)-dione; (6aR,7R,9aR)-11-((3S,5R)-3,5-Dihydroxy-2-methylcyclohex-1-en-1-yl)-7-((R)-6-hydroxy-6-methylheptan-2-yl)-6a-methyl-2-phenyl-4a,6,6a,7,8,9,9a,11-octahydro-1H,5H-cyclopenta[f][1,2,4]triazolo[1,2-a]cinnoline-1,3(2H)-dione.,Calcitriol Impurity
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