O=C(O)c1c2ccccc2nc2ccccc12    mol4990    0_1
O=C([O-])c1c2ccccc2[nH+]c2ccccc12    mol4990    0_2
O=C(O)c1c2ccccc2[nH+]c2ccccc12    mol4990    1_1
O=C([O-])c1c2ccccc2nc2ccccc12    mol4990    -1_1