| 1 | 261-01-8 | pyrimido[4,5-b]quinoline | C11H7N3 | 181.19 | | |
| 2 | 261-05-2 | benzo(b)1,5-naphthyridine | C12H8N2 | 180.21 | | |
| 3 | 261-06-3 | Pyrimido[5,4-b]quinoline | C11H7N3 | 181.19 | | |
| 4 | 261-10-9 | Pyrido[2,1-b]quinazolin-10-ium (8CI,9CI) | C12H9N2 | 181.213 | | |
| 5 | 261-15-4 | Anthyridine | C11H7N3 | 181.19 | | |
| 6 | 261-23-4 | Xanthylium | C13H9O+ | 181.21 | | |
| 7 | 261-24-5 | 10H-[1]Benzopyrano[3,2-c]pyridine | C12H9NO | 183.21 | 70.5-71 °C(Solv: ligroine (8032-32-4)) | |
| 8 | 261-27-8 | 5H-chromeno[2,3-b]pyridine | C12H9NO | 183.21 | 87-88 °C(Solv: carbon tetrachloride (56-23-5)) | |
| 9 | 261-31-4 | 10H-dibenzo(b,e)thiin | C13H10S | 198.28 | 128-131°C | |
| 10 | 261-32-5 | Thioxanthylium | C13H9S | 197.276 | | |
| 11 | 261-37-0 | 5H-[1]Benzothiopyrano[2,3-b]pyridine | C12H9NS | 199.27 | | |
| 12 | 261-39-2 | Dibenzo[b,e]stibinin (9CI) | C13H9Sb | 291.002 | | |
| 13 | 261-42-7 | TELLUROXANTHENE | C13H10Te | 293.82 | 152-155 °C | |
| 14 | 261-43-8 | pyrazino[2,3-g]quinoxaline | C10H6N4 | 182.18 | | |
| 15 | 261-57-4 | Mercury, di-μ-1,2-phenylenedi- (9CI) | C12H8Hg2 | | | |
| 16 | 261-58-5 | Mercury, (iminodi-2,1-phenylene)- (9CI) | C12H9HgN | 367.797 | | |
| 17 | 261-59-6 | Pheniodoxin-5-ium (8CI,9CI) | C12H8IO+ | 295.1 | | |
| 18 | 261-64-3 | Pyridazino[3,4-b]quinoxaline (8CI,9CI) | C10H6N4 | 182.18 | | |
| 19 | 261-65-4 | 1,3,9,10-Tetraazaanthracene | C10H6N4 | 182.18 | | |
| 20 | 261-79-0 | Phenoxazin-5-ium | C12H8NO | 182.198 | | |
| 21 | 261-80-3 | 5H-Benzo[b]pyrido[4,3-e][1,4]oxazine | C11H8N2O | 184.19 | | |
| 22 | 261-83-6 | 10H-Pyrido[3,2-b][1,4]benzoxazine | C11H8N2O | 184.19 | 209-210 °C(Solv: benzene (71-43-2)) | |
| 23 | 261-89-2 | Phenothiazin-5-ium | C12H8NS | 198.264 | | |
| 24 | 261-94-9 | 5H-Pyridazino[3,4-b][1,4]benzothiazine | C10H7N3S | 201.25 | | |
| 25 | 261-95-0 | 5H-Pyrimido[4,5-b][1,4]benzothiazine | C10H7N3S | 201.25 | | |
| 26 | 261-96-1 | 10H-Pyrido(3,2-b)(1,4)benzothiazine | C11H8N2S | 200.26 | 110.0 to 114.0 °C | |
| 27 | 261-98-3 | 10H-Pyrimido[5,4-b][1,4]benzothiazine | C10H7N3S | 201.25 | | |
| 28 | 261-99-4 | 1,2-DIAZAPHENOTHIAZINE | C10H7N3S | 201.25 | | |