[{"from": "human", "value": "Provide a description of this molecule. [C][C][C@@][Branch2][Branch1][C][C][=C][Branch1][#Branch1][C][O][C][Ring1][=Branch1][=O][C][=Branch1][C][=O][N][C][C][=C][C][=C][Branch1][S][C][=C][C][=Branch1][#Branch2][=C][Ring1][=Branch1][C][N][Branch1][C][C][C][O][N][=C][Ring1][#C][C][Ring2][Ring1][C][=C][Ring2][Ring1][O][O]"}, {"from": "gpt", "value": "The molecule is a pyranoindolizinoquinoline used as an antineoplastic agent. It is a derivative of camptothecin and works by binding to the topoisomerase I-DNA complex and preventing religation of these 328 single strand breaks. It has a role as an EC 5.99.1.2 (DNA topoisomerase) inhibitor and an antineoplastic agent."}]