| 1 | 257-05-6 | Dibenz[b,f]oxepin | Dibenz[b,f]oxepin | C14H10O | | |
| 2 | 257-07-8 | 二苯并[B,F][1,4]噁唑频 | Dibenz-(b,f)-1,4-oxazephine | C13H9NO | | |
| 3 | 257-08-9 | | 11H-Dibenzo[b,e][1,4]dioxepin | C13H10O2 | | |
| 4 | 257-09-0 | | Dibenz[b,f][1,4,5]oxadiazepine (9CI) | C12H8N2O | | |
| 5 | 257-13-6 | Dibenzo[b,f]thiepin | Dibenzo[b,f]thiepin | C14H10S | | |
| 6 | 257-15-8 | Dibenzo(B,F)1,4-Thiazepine | Dibenzo(B,F)1,4-Thiazepine | C13H9NS | | |
| 7 | 257-17-0 | | Dibenzo[b,f][1,4,5]thiadiazepine (9CI) | C12H8N2S | | |
| 8 | 257-24-9 | 【草(之上)+黑】 | heptalene | C12H10 | | |
| 9 | 257-25-0 | 三乙氧基镓 | GALLIUM ETHOXIDE | C10H8O2 | | |
| 10 | 257-27-2 | 1H-Cyclohepta[e][1,3]dioxepin (9CI) | 1H-Cyclohepta[e][1,3]dioxepin (9CI) | C10H10O2 | | |
| 11 | 257-29-4 | | Cyclohepta[b][1,4]diazepine (8CI,9CI) | C10H8N2 | | |
| 12 | 257-31-8 | 3,6,10,14-Tetraoxapentacyclo[7.5.0.02,8.04,12.05,11]tetradecane (8CI,9CI) | 3,6,10,14-Tetraoxapentacyclo[7.5.0.02,8.04,12.05,11]tetradecane (8CI,9CI) | C10H12O4 | | |
| 13 | 257-32-9 | 3,6,10,13-Tetraoxapentacyclo[7.5.0.02,8.04,12.05,11]tetradecane (8CI,9CI) | 3,6,10,13-Tetraoxapentacyclo[7.5.0.02,8.04,12.05,11]tetradecane (8CI,9CI) | C10H12O4 | | |
| 14 | 257-55-6 | Octalene | Octalene | C14H12 | | |
| 15 | 257-62-5 | | 1,3-Dioxolo[4,5-g]pyrrolo[1,2-b]isoquinoline (8CI,9CI) | C13H9NO2 | | |
| 16 | 257-68-1 | 10H-1,3-Dioxolo[4,5-g]thiazolo[2,3-b]quinazoline (8CI,9CI) | 10H-1,3-Dioxolo[4,5-g]thiazolo[2,3-b]quinazoline (8CI,9CI) | C11H8N2O2S | | |
| 17 | 257-81-8 | | Naphtho[2,3-g]quinoline | C17H11N | | |
| 18 | 257-82-9 | | Naphtho[2,3-g]quinazoline (8CI,9CI) | C16H10N2 | | |
| 19 | 257-89-6 | Benz[b]acridine | Benz[b]acridine | C17H11N | | |
| 20 | 257-97-6 | N,N'-(2,3-Naphthalenediyl)-1,2-benzoquinone diimine | N,N'-(2,3-Naphthalenediyl)-1,2-benzoquinone diimine | C16H10N2 | | |
| 21 | 257-99-8 | | Naphtho[2,3-g]pteridine (8CI,9CI) | C14H8N4 | | |