C[NH2+]C(C)(C)C(=O)[O-]    mol12491    0_1
CNC(C)(C)C(=O)O    mol12491    0_2
C[NH2+]C(C)(C)C(=O)O    mol12491    1_1
CNC(C)(C)C(=O)[O-]    mol12491    -1_1