COCC[NH+](CCOC)CC(=O)[O-]    mol8531    0_1
COCCN(CCOC)CC(=O)O    mol8531    0_2
COCC[NH+](CCOC)CC(=O)O    mol8531    1_1
COCCN(CCOC)CC(=O)[O-]    mol8531    -1_1