adapalene
nounUS /əˈdæp.əˌlin/
Etymology Probably from ada(mantyl) + p(henyl) + (naphth)alene.
1
Chemistry, Medicine, Natural sciences, Organic chemistry, Pharmacology, Physical sciences, Sciences A retinoid C₂₈H₂₈O₃ applied topically to the skin in the treatment of acne vulgaris. It is marketed under the trademark Differin and when used in combination with benzoyl peroxide, under the trademark Epiduo.