[{"from": "human", "value": "Create a molecule with the structure as the one described. The molecule is a monofunctional alkylating agent with potential antineoplastic activity.  Reacting with DNA mainly at guanine and adenine residues, ethylenimine alkylates DNA, thereby producing DNA interstrand crosslinks and DNA breaks, and interfering with DNA replication and cell division. (NCI04)"}, {"from": "gpt", "value": "[C][C][N][Ring1][Ring1]"}]