2 3-dinitrobenzoic acid July 8, 2019 16 32 64 128 2 3 dinitrobenzoic acid 2 hydroxy 3 5 dinitrobenzoic acid 2 4-dinitrobenzoic acid 2 6-dinitrobenzoic acid 3 5-dinitrobenzoic acid 3 5-dinitrobenzoic acid pka