O=C(O)Cc1c[nH]c2ccccc12    mol1901    0_1
O=C([O-])Cc1c[nH]c2ccccc12    mol1901    -1_1
O=C(O)Cc1c[n-]c2ccccc12    mol1901    -1_2
O=C([O-])Cc1c[n-]c2ccccc12    mol1901    -2_1