Cc1[nH+]c2c(=O)n(C)c([O-])nc2n(C)c1=O    mol8228    0_1
Cc1nc2c(=O)n(C)c(O)nc2n(C)c1=O    mol8228    0_2
Cc1nc2c(=O)n(C)c([O-])nc2n(C)c1=O    mol8228    -1_1