2-but-3-ynyl-2-prop-1-en-2-yl-1,3-dioxolane

2-oct-3-ynyl-2-prop-1-en-2-yl-1,3-dioxolane

10-(oxan-2-yloxy)dec-5-en-2-one

methyl 7-(2,3,5-trioxocyclopentyl)hept-5-enoate

7-(trichloromethylcarbonylamino)-6,7-dihydro-2-(p-toluenesulfonyl)-5H-cyclopenta[b]pyridine