CNC(=O)N(C)[C@@H](C)C(=O)O    mol34168    0_1
C[N-]C(=O)N(C)[C@@H](C)C(=O)O    mol34168    -1_1
CNC(=O)N(C)[C@@H](C)C(=O)[O-]    mol34168    -1_2