High Quality Content by WIKIPEDIA articles! The Marker degradation is a three-step synthetic route in steroid chemistry developed by American chemist Russell Earl Marker in 1938–40. It is used for the production of cortisone and mammalian sex hormones (progesterone, estradiol, etc.) from plant steroids, and established Mexico as a world center for steroid production in the years immediately after World War II. The discovery of the Marker degradation allowed the production of substantial quantities of steroid hormones for the first time, and was fundamental in the development of the contraceptive pill and corticosteroid anti- inflammatory drugs. In 1999, the American Chemical Society and the Sociedad Quimica de Mexico named the route as a National Historic Chemical Landmark.

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