(2,2,5,5-tetramethylcyclopent-3-en-1-ylidene)hydrazine

2,2,4,4-tetramethyl-3-oxocyclopentylxanthogenate

4-diazo-3,3,5,5-tetramethylcyclopentene

1,1,4,4,8,8,11,11-octamethyl-6-thia-12,13-diazadispiro(4.1.4.2)trideca-2,9,12-triene

2,2,5,5-tetramethylcyclopent-3-ene-1-thione