[{"from": "human", "value": "What can you tell me about this molecule? [C][C][O][C][=Branch1][C][=O][N][P][=Branch1][C][=O][Branch1][=Branch1][N][C][C][Ring1][Ring1][N][C][C][Ring1][Ring1]"}, {"from": "gpt", "value": "The molecule is an aziridine alkylating agent that cross-links with DNA, causing inhibition of DNA synthesis. It has been used as a chemosterilant. (NCI)"}]