Crystal structure and Hirshfeld surface analysis of 3-oxours-12-ene-27a,28-dioic acid (quafrinoic acid)

The title compound, known as quafrinoic acid, is a penta­cyclic triterpene isolated from Nauclea Pobeguinii. The compound is composed of five fused six-membered rings and the mol­ecular conformation is stabilized by intra­molecular C—H⋯O inter­action, forming S6 and S8 rings.