C=CCC1(CC)C(=O)NC(=O)NC1=O    mol31799    0_1
C=CCC1(CC)C(=O)[N-]C(=O)NC1=O    mol31799    -1_1
C=CCC1(CC)C(=O)[N-]C(=O)[N-]C1=O    mol31799    -2_1