O=C([O-])CN1CCOCC[NH+](CC(=O)[O-])CC1    mol38318    -1_1
O=C([O-])CN1CCOCCN(CC(=O)O)CC1    mol38318    -1_2
O=C([O-])CN1CCOCCN(CC(=O)[O-])CC1    mol38318    -2_1