CNCC(=O)NCC(=O)OC    mol36542    0_1
CNCC(=O)NCC(=[OH+])OC    mol36542    1_1
C[NH2+]CC(=O)NCC(=O)OC    mol36542    1_2
CNCC(=[OH+])NCC(=O)OC    mol36542    1_3