[{"from": "human", "value": "Create a molecule that satisfies the conditions outlined in the description. The molecule is an organochlorine compound that is urea in which the two hydrogens on one of the amino groups are replaced by nitroso and 2-chloroethyl groups and one hydrogen from the other amino group is replaced by a 4-amino-2-methylpyrimidin-5-ylmethyl] group. An antineoplastic agent especially effective against malignant brain tumors. It has a role as an alkylating agent and an antineoplastic agent. It is an organochlorine compound, an aminopyrimidine and a member of N-nitrosoureas. It is a conjugate base of a nimustine(1+)."}, {"from": "gpt", "value": "[C][C][=N][C][=C][Branch1][Branch2][C][=Branch1][Ring2][=N][Ring1][=Branch1][N][C][N][C][=Branch1][C][=O][N][Branch1][Ring2][C][C][Cl][N][=O]"}]