| 1 | 266-11-5 | | Mercury, [[6-[[(ethenyl-κC2)oxy]methylene]-2,4-cyclohexadien-1-ylidene]methanolato(2-)-κO]- (9CI) | C10H8HgO2 | | |
| 2 | 266-28-4 | | Benzocyclodecene (8CI,9CI) | C14H12 | | |
| 3 | 266-58-0 | | Benzocyclotetradecene | C18H16 | | |
| 4 | 266-71-7 | | Benzocyclooctadecene (8CI,9CI) | C22H20 | | |