Calcitriol EP Impurity B (epi-Calcitriol)

(1R,3S)-5-((E)-2-((1R,3aR,7aR)-1-((R)-6-hydroxy-6-methylheptan-2-yl)-7a-methyl-2,3,3a,6,7,7a-hexahydro-1H-inden-4-yl)vinyl)-4-methylcyclohex-4-ene-1,3-diol

(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,5,6,6a,7,8,9,9a-octahydrocyclopenta[f][1,2,4]triazolo[1,2-a]cinnoline-1,3(2H,11H)-dione

3-(((1-(4-(3,5-dioxo-3H-1,2,4-triazol-4(5H)-yl)phenyl)ethylidene)amino)oxy)-N,N,N-trimethylpropan-1-aminium bromide