1β,15α-Dihy­droxy-16α,17-ep­oxy­pregn-4-ene-3,20-dione

The title mol­ecule, C₂₁H₂₈O₅, is composed of three six-membered rings (A/B/C) and a five-membered ring (D). Ring A adopts a 1α-sofa conformation, while rings B and C adopt chair conformations. Cyclo­pentane ring D adopts a 14α-envelope conformation. In the crystal, O—H...O hydrogen bonds lead to the formation of ribbons running along the a axis. The structure is further consolidated by C—H...O inter­actions, which link the molecules head-to-tail into ribbons along the a axis.