adapalene

noun

adap·​a·​lene ə-ˈdap-ə-ˌlēn 

: a retinoid C₂₈H₂₈O₃ applied topically to the skin in the treatment of acne vulgaris

Note: Adapalene is marketed under the trademark Differin and when used in combination with benzoyl peroxide, under the trademark Epiduo.