Calcipotriol EP Impurity H

(1R,1’R,3S,3’S,5Z,5’Z)-5,5′-((2E,2’E)-((1R,1’R,3aS,3a’S,7aR,7a’R)-((2R,2’R,3E,3’E,5R,5’R)-oxybis(5-cyclopropylpent-3-ene-5,2-diyl))bis(7a-methylhexahydro-1H-indene-1(2H)-yl-4(2H)-ylidene))bis(ethane-2,1-diylidene))bis(4-methylenecyclohexane-1,3-diol)