]-7a-methyl-2,3,3a,5,6,7-hexahydro-1H-inden-4-ylidene]ethylidene]-4-methyli denecyclohexane-1,3-diol
?
Tacalcitol is a synthetic vitamin D3 analogue that is used to treat psoriasis. Tacalcitol exerts its biological activity by preventing the proliferation of keratinocytes. Tacalcitol is marketed under several names, including Curatoderm and Bonalfa.