6-己内酯

dispiro[cyclohexane-1,3'-[1.2.4]trioxan-6',1''-cyclohexane]

hexahydrospiro[benzo[e][1,2,4]trioxine-3,1'-cyclohexane]

2,2-diphenyl-1,4-dioxaspiro[4.5]decane

3,3-diphenyl-1,2,5-trioxaspiro[5.5]undecane