O=C1C[C@@H]2C(=O)NC(=O)[C@@H]2N1    mol32550    0_1
O=C1C[C@@H]2C(=O)[N-]C(=O)[C@@H]2N1    mol32550    -1_1
O=C1C[C@@H]2C(=O)NC(=O)[C@@H]2[N-]1    mol32550    -1_2