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

2,2,4,4-tetramethylcyclobutane-1-thione

di-(tert-butyl)-Diazomethane

2-diazo-1,1,3,3-tetramethylcyclobutane

7,7-Di-tert-butyl-1,1,3,3-tetramethyl-8-thia-5,6-diazaspiro(3.4)oct-5-en