1,1,3,3-tetramethyl-2-(2,2,4,4-tetramethylcyclobutylidene)cyclobutane

1,1,3,3,6,6,8,8-octamethyl-9-thiadispiro[3.0.3⁵.1⁴]nonane

1,1,3,3,6,6,9,9-octamethyl-10-thia-7,8-diazadispiro[3.0.4⁵.1⁴]dec-7-ene

1,1,3,3,6,6,9,9-octamethyl-10-thiadispiro[3.0.4⁵.1⁴]decane

1,1,3,3,6,6,10,10-octamethyl-8-oxa-11-thiadispiro[3.0.5⁵.1⁴]undecane