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NS 8 Epi-Calcitriol 1-epi-Calcitriol Rocaltrol Impurity B Calcitriol impurity B Impurity B of Calcitrio Calcitriol EP Impurity B IMpurity B of Calcitriol 1beta,25-Dihydroxyvitamin-D3 [3H]-1,25-Dihydroxyvitamin D3 1beta,25-Dihydroxycholecalciferol 1,25-Dihydroxy Vitamin D3 Impurity B Calcitriol EP Impurity B (epi-Calcitriol) Calcitriol Impurity 2(Calcitriol EP Impurity B) (1R,3R,Z)-5-((E)-2-((1R,3aS,7aR)-1-((R)-6-hydroxy-6-Methylheptan-2-yl)-7a-Methylhexahydro-1H-inden-4(2H)-ylidene)ethylidene)-4-Methylenecyclohexane-1,3-diol 1,3-Cyclohexanediol, 4-methylene-5-[(2E)-2-[(1R,3aS,4E,7aR)-octahydro-1-[(1R)-5-hydroxy-1,5-dimethylhexyl]-7a-methyl-4H-inden-4-ylidene]ethylidene]-, (1R,3R)- Calcitriol EP Impurity B/epi-Calcitriol/(1R,3R,Z)-5-(2-((1R,3aS,7aR,E)-1-((R)-6-Hydroxy-6-methylheptan-2-yl)-7a-methyloctahydro-4H-inden-4-ylidene)ethylidene)-4-methylenecyclohexane-1,3-diol