| 287-92-3 | Cyclopentane | C5H10 |
| 287-50-3 | 1,3-Dioxetane | C2H4O2 |
| 287-26-3 | Phosphetane | C3H7P |
| 287-29-6 | Silacyclobutane | C3H8 Si |
| 287-33-2 | 1,2-Oxazetidine | C2H5NO |
| 287-34-3 | 1,2-Thiazetidine | C2H5NS |
| 287-53-6 | 1,3-Dithietane | C2H4 S2 |
| 287-93-4 | 1H-Germole | C4H6Ge |
| 287-95-6 | 3H-Pyrrole | C4H5 N |
| 287-99-0 | 2H-Furylium | C4H5O |