[{"from": "human", "value": "Describe this molecule. [C][Branch2][Ring1][=Branch1][C][N][P][=Branch1][C][=O][Branch1][#Branch2][N][Branch1][Ring2][C][C][Cl][C][C][Cl][O][C][C][Cl][C][O]"}, {"from": "gpt", "value": "The molecule is a nitrogen mustard compound that cross-links with DNA, causing inhibition of DNA synthesis. (NCI)"}]