<unk>  is both an ester and a glycoside; a glycosylated benzoquinone extracted from bearberry plant in the genus Arctostaphylos. It inhibits tyrosinase and thus prevents the formation of melanin.<unk>  is therefore used as a skin-lightening agent.<unk>  is also found in wheat, and is concentrated in pear skins.
Arbutin
Arbutamine
Talbutal
Trimebutine
Tolbutamide
Ceftibuten
Oxybutynin 
Orlistat