1β-Calcidol;(1R,3R,Z)-5-((E)-2-((1R,7aR)-7a-Methyl-1-((R)-6-Methylheptan-2-yl)dihydro-1H-inden-4(2H,5H,6H,7H,7aH)-ylidene)ethylidene)-4-Methylenecyclohexane-1,3-diol;IMpurity B of Alfacalcidol
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