CCn1nc(CC(=O)[O-])n[nH+]1    mol14136    0_1
CCn1nnc(CC(=O)O)n1    mol14136    0_2
CCn1nnc(CC(=O)[O-])[nH+]1    mol14136    0_3
CCn1n[nH+]c(CC(=O)[O-])n1    mol14136    0_4
CCn1nnc(CC(=O)[O-])n1    mol14136    -1_1