Cc1[nH+]c2c(=O)n(C)c(=O)n(C)c2nc1[O-]    mol8227    0_1
Cc1nc2c(=O)n(C)c(=O)n(C)c2nc1O    mol8227    0_2
Cc1nc2c(=O)n(C)c(=O)n(C)c2nc1[O-]    mol8227    -1_1