1,1,4,4,8,8,11,11-octamethyl-6-thiadispiro(4.0.4.1)undeca-2,9-diene

2,2,2',2',5,5,5',5'-octamethyl-[1,1'-bi(cyclopentylidene)]-3'-ene-3,4-diol

3,3,6,6,8,8-hexamethyl-7-(2',2',5',5'-tetramethylcyclopent-3-ene-1-ylidene)-2,4-dioxabicyclo(3.3.0)octane

3,3,6,6,8,8-hexamethyl-7-(2',2',5',5'-tetramethyl-3,4-dihydroxycyclopentylidene)-2,4-dioxabicyclo(3.3.0)octane