Compounds that contain both carbonyl and alcohol functional groups are often more stable a...

Compounds that contain both carbonyl and alcohol functional groups are often more stable as cyclic hemiacetals or cyclic acetals than as open-chain compounds. Examples of several of these are shown. Deduce the structure of the open-chain form of each.

Brevicomin (sex attractant of Western pine beetle)

Talaromycin A (a toxic substance produced by a fungus that grows on poultry house litter)