<unk> s are a series of closely related chemical compounds that are components of a variety of essential oils.  The<unk> s belong to a family of chemicals known as rose ketones, which also includes damascones and ionones.  beta-Damascenone is a major contributor to the aroma of roses, despite its very low concentration, and is an important fragrance chemical used in perfumery.
Biochemically, the<unk> s are derived from the degradation of carotenoids.
Damascenone
Etafenone
Propafenone
Boldenone
Pramocaine
Anthralin
Lofexidine
Triprolidine