Cn1c(-c2ccccc2[O-])[nH+]c2ccccc21 mol15286 0_1 Cn1c(-c2ccccc2O)nc2ccccc21 mol15286 0_2 Cn1c(-c2ccccc2O)[nH+]c2ccccc21 mol15286 1_1 Cn1c(-c2ccccc2[O-])nc2ccccc21 mol15286 -1_1