3-thiatricyclo[3.3.0.06,8]octane 3,3-dioxide

4-thia-8,9-diazatricyclo<5.3.0.02,6>dec-8-ene 4,4-dioxide

(1R,2S)-1,2-bis(ethenyl)cyclopropane

bicyclo[4.1.0]hept-4-ene