Sipe­imine, a steroidal alkaloid from Fritillaria roylei Hooker

In the title compound, 3,20-dihydroxycevan-6-one, C27H43NO3, all the six-membered rings have normal chair conformations except ring D, which exists in a twist-chair conformation. The five-membered ring C adopts an envelope conformation. An O—H⋯O hydrogen bond connects the mol­ecules into spirals, which run along the b-axis direction.