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

hepta-4,6-diyn-1-ol

3-chloro-6-pent-4-ynoxypyridazine

1-oxacyclotrideca-4,7-dien-2-one