[{"from": "human", "value": "Describe this molecule. [C][C@][C][C][C@H1][Branch2][Branch1][#Branch1][C][Branch2][Ring2][#C][C@@H1][Ring1][=Branch1][C][C][C@@][Branch2][Ring2][Branch1][C@@H1][Ring1][#Branch2][C][=C][C][=C][C][C][Branch2][Ring1][Branch1][C][C][C@@][Ring1][=Branch1][Branch1][=Branch2][C][C][C@][Ring1][#Branch2][Ring1][=C][C][C][=Branch1][C][=O][O][Branch1][C][C][C][C][Branch1][C][C][C][O]"}, {"from": "gpt", "value": "The molecule is a pentacyclic triterpenoid that is oleana-11,13(18)-diene substituted by an alpha-hydroxy group at position 3 and a carboxy group at position 28. It has been isolated from the leaves and twigs of Fatsia polycarpa. It has a role as a metabolite and a plant metabolite. It is a hydroxy monocarboxylic acid and a pentacyclic triterpenoid. It derives from a hydride of an oleanane."}]