3-Oxoolean-1-en-28-oic acid–n-hexa­ne–water (4/1/1) from the bark of Walsura pinnata Hassk

3-Oxoolean-1-en-28-oic acid, isolated from the bark of Walsura pinnata Hassk, crystallized from n-hexane as an n-hexane 0.25-solvent 0.25-hydrate, C(30)H(46)O(3)·0.25C(6)H(14)·0.25H(2)O. There are two independent mol­ecules in the asymmetric unit of the title compound. The three six-membered cyclo­hexane rings in each mol­ecule adopt chair conformations and the carboxyl substituent occupies an axial/equatorial position. The two independent mol­ecules are linked by a pair of O—H(carbox­yl)⋯O hydrogen bonds into a dimer. The n-hexane mol­ecule is disordered about a twofold rotation axis and the water mol­ecule lies on a twofold rotation axis. In addition, the cyclo­hexone carbonyl group of one of the independent mol­ecules is disordered over two sites with occupancies of 0.75 and 0.25.