| PABA | Para-amino benzoic acid |
| 3-API | 2-(3-aminophenyl)indole |
| 4-API | 2-(4-aminophenyl)indole |
| 3-APB | 2-(3-aminophenyl)benzimidazole |
| 4-APB | 2-(4-aminophenyl)benzimidazole |
| 3-API-B | Benzamide of 3-API |
| 4-API-B | Benzamide of 4-API |
| 3-APB-B | Benzamide of 3-APB |
| 4-APB-B | Benzamide of 4-APB |
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