3-Oxoolean-1-en-28-oic acid-n-hexa-ne-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.