Seocalcitol

(1R,3S,5Z)-5-((2E)-((1R,3aS,7aR)-1-((1R,2E,4E)-6-Ethyl-6-hydroxy-1-methyl-2,4-octadienyl)octahydro-7a-methyl-4H-inden-4-ylidene)ethylidene)-4-methylene-1,3-cyclohexanediol

(1R,3S,5Z)-5-[(2E)-2-[(1R,3aS,7aR)-1-[(1R,2E,4E)-6-Ethyl-6-hydroxy-1-methyl-2,4-octadien-1-yl]-octahydro-7α-methyl-4H-inden-4-ylidene]ethylidene]-4-methylene-1,3-cyclohexanediol