| 1 | 231-00-5 | 2H-Benzo[a]quinolizine (8CI,9CI) | C13H11N | 181.23 | | |
| 2 | 231-02-7 | Benzo[a]quinolizinium | | | | |
| 3 | 231-20-9 | Pyrido[3,2-h]cinnoline (6CI,8CI,9CI) | C11H7N3 | 181.19 | | |
| 4 | 231-21-0 | Pyrido[2,3-f]quinoxaline | C11H7N3 | 181.19 | | |
| 5 | 231-23-2 | 1,4,5,8-TETRAAZAPHENANTHRENE | C10H6N4 | 182.18 | 249-252 °C | |
| 6 | 231-30-1 | Pyrano[3,2-h]-1,3-benzoxazine (8CI,9CI) | C11H7NO2 | 185.18 | | |
| 7 | 231-313-2 | ALPHA-HYDROXYBENZYLPHOSPHINIC ACID SODIU | C7H10NaO3P | 196.12 | | |
| 8 | 231-36-7 | DIQUAT DIBROMIDE | C12H10N2+2 | 182.22 | | |
| 9 | 231-38-9 | 4aH-Benzo[c]quinolizine | C13H11N | 181.23 | | |
| 10 | 231-40-3 | Benzo[c]quinolizinium | | | | |
| 11 | 231-56-1 | 6aH-Cyclohepta[a]naphthalene | C15H12 | 192.26 | | |
| 12 | 231-95-8 | Cycloocta[a]naphthalene (8CI,9CI) | C16H12 | 204.27 | | |
| 13 | 231-960-0 | Manganese fluoride | F2Mn | 92.93 | | |