Nc1ncc(C(=O)[O-])c[nH+]1    mol18748    0_1
[NH3+]c1ncc(C(=O)[O-])cn1    mol18748    0_2
Nc1ncc(C(=O)O)cn1    mol18748    0_3
[NH3+]c1ncc(C(=O)O)cn1    mol18748    1_1
Nc1ncc(C(=O)O)c[nH+]1    mol18748    1_2
[NH3+]c1ncc(C(=O)[O-])c[nH+]1    mol18748    1_3
Nc1[nH+]cc(C(=O)[O-])c[nH+]1    mol18748    1_4