2-(Ethylamino)-1,2-diphenylethanone (also known as α-ethylamino-deoxybenzoin, [α-(Ethylamino)benzyl]-(phenyl)-ketone and βk-Ephenidine) is a chemical compound which was first invented in 1955, researched by ICI in 1969 as an antidepressant, and subsequently claimed by AstraZeneca as an inhibitor of the enzyme 11β-Hydroxysteroid dehydrogenase type 1.