Archangelica: A coumarin that occurs in the roots of the Angelica plant.

Coumarins: Coumarins are lactones of hydroxycinnamic acids. Coumarins are lactones. There are many variations of coumarins: Furanocoumarins found in Angelica have a spasmolitic effect but must be used with caution as they have a strong phototoxic effect as has many of the Furanocoumarins (Warfarin a blood thinning drug but also virulent rat poison, is a coumarin derivative). In general coumarins have antifungal, hypotensive, anticoagulant and antimicrobial properties.
Many of the Coumarins are phototoxic and skin sensitising.

Lactones: A lactone is an Ester that's functional group has become part of a ring structure with carbon atoms.

Lactones are widely present in the plant kingdom and many are expectorants and febrifuges.