O=C([O-])C[NH2+]CC(=O)O    mol9215    0_1
O=C(O)CNCC(=O)O    mol9215    0_2
O=C(O)C[NH2+]CC(=O)O    mol9215    1_1
O=C([O-])CNCC(=O)O    mol9215    -1_1
O=C([O-])C[NH2+]CC(=O)[O-]    mol9215    -1_2
O=C([O-])CNCC(=O)[O-]    mol9215    -2_1