Cyclopentadecanolide is a natural macrolide lactone and a synthetic musk.

Cyclopentadecanolide occurs in small quantities in angelica root essential oil and is responsible for its musklike odor.

[3] Cyclopentadecanolide is produced synthetically by ring expansion of cyclotetradecanone.

[3] Cyclopentadecanolide is used as a musklike perfume fixative in fine fragrances and as a flavoring agent.

[4] It is a substitute for the extremely expensive animal musk.