Cn1c(=O)c2c([nH+]cn2CC(=O)[O-])n(C)c1=O    mol15144    0_1
Cn1c(=O)c2c(ncn2CC(=O)O)n(C)c1=O    mol15144    0_2
Cn1c(=O)c2c(ncn2CC(=O)[O-])n(C)c1=O    mol15144    -1_1