| 261-31-4 | THIOXANTHENE | C13H10 S |
| 261-15-4 | Anthyridine | C11H7 N3 |
| 261-40-5 | 9H-Selenoxanthene | C13H10Se |
| 261-42-7 | TELLUROXANTHENE | C13H10 Te |
| 261-59-6 | Pheniodoxin-5-ium(8CI,9CI) | C12H8 I O |
| 261-79-0 | Phenoxazin-5-ium | C12H8 N O |
| 261-86-9 | 1H-Phenothiazine | C12H9NS |
| 261-89-2 | Phenothiazin-5-ium | C12H8 N S |
| 261-99-4 | 1,2-DIAZAPHENOTHIAZINE | C10H7 N3 S |