Eldecalcitol Impurity 43

(1R,2S,3S, Z) -5- (2- ((1R,3aS,7aR, E) -1- ((R) -6-hydroxy-6-methylheptan-2-yl) -7a-methyloctahydro-4H-inden-4-ylidene) ethylidene) -3- (3-hydroxypropoxy) -4-methylenecyclohexane-1,2-diol