5,5,7,7-tetramethyl-1-oxa-6-azaspiro[2.5]octane

1-(benzenesulfonyl)-2-phenylazetidine

1-(4-chlorophenyl)sulfonyl-2-phenylazetidine

3-methyl-4-methylsulfanyl-3,5-diazabicyclo[4.1.0]hept-4-en-2-one