[{"from": "human", "value": "Describe this molecule. [C][C][=C][C@@H1][Branch2][Ring2][P][C][C@H1][C@][Branch2][Ring2][#Branch2][C@H1][Branch2][Ring1][Ring2][C][C@@H1][Branch1][#Branch2][C@@][Ring1][=Branch1][C@@H1][Ring1][#Branch2][O][Ring1][Ring1][O][C][=Branch1][C][=O][C][C][Branch1][N][C][=C][C@H1][Ring1][#C][O][C][=Branch1][C][=O][C][Branch1][C][C][C][C][O][C][Ring2][Ring1][=N][=O]"}, {"from": "gpt", "value": "The molecule is an abietane diterpenoid that is ent-abieta-2(3),13(15)-diene-16,12-olide substituted by beta-acetoxy groups at positions 1 and 7 and a beta-epoxy group across positions 8 and 14. Isolated from the leaves of Gelonium aequoreum, it exhibits moderate cytotoxicity against lung (A549), breast (MDAMB-231 and MCF7), and liver (HepG2) cancer cell lines. It has a role as a metabolite and an antineoplastic agent. It is a gamma-lactone, an abietane diterpenoid, an acetate ester, an epoxide and an organic heteropentacyclic compound."}]