| 291-59-8 | Cyclohexasilane | H12Si6 |
| 291-69-0 | 1H-Azepine | C6H7 N |
| 291-64-5 | Cycloheptane | C7H14 |
| 291-21-4 | 1,3,5-Trithiane | C3H6S3 |
| 291-08-7 | 1,4-Diaza-2,6-disilacyclohexane(8CI,9CI) | C2H10 N2 Si2 |
| 291-10-1 | 1,4-Diaza-2,5-disilacyclohexane(8CI,9CI) | C2H10 N2 Si2 |
| 291-22-5 | 1,2,4,5-Tetrathiane | C2H4 S4 |
| 291-25-8 | 1,3,5-Triselenane | C3H6 Se3 |
| 291-27-0 | 1,3,5-Trisilacyclohexane | C3H12 Si3 |
| 291-43-0 | Cyclotrisilazane | H9N3 Si3 |
| 291-50-9 | Cyclotrisiloxane | H6O3Si3 |
| 291-78-1 | 1H-1,2-Diazepine | C5H6N2 |
| 291-92-9 | 1,3-dioxepine | C5H6 O2 |
| 291-98-5 | 1,3-Dithiepin | C5H6S2 |