4-benzoyl-1-oxa-4-aza-spiro[4.5]decane

2,3-Dioxabicyclo(2.2.2)oct-5-ene

3-(1-phenylethenyl)-1,2,5-trioxaspiro[5.5]undecan-9-one

(1s,4s)-4-((diethylamino)oxy)cyclohexan-1-ol

6-phenylsulfanyl-1,4-dioxaspiro[4.5]dec-9-en-8-one