[{"from": "human", "value": "Create a molecule that satisfies the conditions outlined in the description. The molecule is a principal metabolite of hexamethylmelamine with antineoplastic activity.  Pentamethylmelamine alkylates DNA and other macromolecules and forms DNA intrastrand and DNA-protein crosslinks, thereby preventing DNA replication. (NCI04)"}, {"from": "gpt", "value": "[C][N][C][=N][C][=Branch1][=N][=N][C][=Branch1][Ring2][=N][Ring1][=Branch1][N][Branch1][C][C][C][N][Branch1][C][C][C]"}]