| 1 | 256-07-5 | 5-Oxa-1-azatricyclo[5.4.0.03,9]undecane (8CI,9CI) | C9H15NO | 153.22 | | |
| 2 | 256-24-6 | Mercury, hexa-μ-1,2-phenylenehexa-, cyclo (9CI) | C36H24Hg6 | 1660.13 | | |
| 3 | 256-25-7 | Tetrabenzo[a,d,g,j]cyclododecene (8CI,9CI) | C28H20 | 356.46 | | |
| 4 | 256-48-4 | 12H-Dibenzo[d,g][1,3]dioxocin | C14H12O2 | 212.24 | | |
| 5 | 256-49-5 | 12H-Dibenzo[d,g][1,3,2]dioxaphosphocin | C13H11O2P | 230.2 | | |
| 6 | 256-80-4 | 10H-Dibenzo[a,d]cycloheptene | C15H12 | 192.26 | | |
| 7 | 256-81-5 | 5H-dibenzo[a,d]cycloheptene | C15H12 | 192.26 | 46 °C | |
| 8 | 256-86-0 | 11H-Dibenz[b,e]azepine | C14H11N | 193.24 | 62 °C | |
| 9 | 256-90-6 | dibenzo(c,f)(1,2)diazepine | C13H10N2 | 194.23 | | |
| 10 | 256-91-7 | 11H-Dibenzo[c,f][1,2]diazepine | C13H10N2 | 194.23 | | |
| 11 | 256-92-2 | 5H-Dibenzbfazepine | | | | |
| 12 | 256-96-2 | Iminostilbene | C14H11N | 193.24 | 197-201℃ | |