Nc1ccccc1Nc1c2ccccc2nc2ccccc12 mol20189 0_1 [NH3+]c1ccccc1Nc1c2ccccc2nc2ccccc12 mol20189 1_1 Nc1ccccc1Nc1c2ccccc2[nH+]c2ccccc12 mol20189 1_2 Nc1ccccc1[NH2+]c1c2ccccc2nc2ccccc12 mol20189 1_3