| Name | CAS No. | Details |
| 2,3,5, 6-tetramethyl-1, 4-phenylenediamine | 3102-87-2 | Details |
| 2,3, 6-triaminopyridine | 4318-79-0 | Details |
| 2,4,6-Trimethyl-m-phenylenediamine | 3102-70-3 | Details |
| 1H-Isoindole-5-carboxylicacid, 2,2'-(2-methyl-1,4-phenylene)bis[2,3-dihydro-1,3-dioxo- | 114731-67-8 | Details |
| 2,5-diamino-4'-(dimethylamino)-4-nitrostilbene | 154151-01-6 | Details |
| 2-methyl-p-phenylenediamine | 95-70-5 | Details |
| 2,5-Pyridinedicarboxylic acid | 100-26-5 | Details |
| 2,5-dimethylbenzene-1,4-diamine | 6393-01-7 | Details |
| 2,5-Dichloro-4-phenylenediamine | 20103-09-7 | Details |
| 2,5-dihydroxyterephthalic acid | 610-92-4 | Details |
| 2,6-(4,4' -aminophenyl) -benisoazole | 17200-77-0 | Details |
| 2,6-(4,4'-aminophenyl)trans- benzobisoxazole | 26740-54-5 | Details |