C=CCN(CC(=O)O)CC(=O)O    mol10239    0_1
C=CC[NH+](CC(=O)[O-])CC(=O)O    mol10239    0_2
C=CCN(CC(=O)[O-])CC(=O)O    mol10239    -1_1
C=CC[NH+](CC(=O)[O-])CC(=O)[O-]    mol10239    -1_2
C=CCN(CC(=O)[O-])CC(=O)[O-]    mol10239    -2_1