After two years, Glidden abandoned production of cortisone to concentrate on Substance S. Julian developed a multistep process for conversion of pregnenolone, available in abundance from soybean oil sterols, to cortexolone. In 1952, Glidden, which had been producing progesterone and other steroids from soybean oil, shut down its own production and began importing them from Mexico through an arrangement with Diosynth (a small Mexican company founded in 1947 by Russell Marker after leaving Syntex). Glidden's cost of production of cortexolone was relatively high, so Upjohn decided to use progesterone, available in large quantity at low cost from Syntex, to produce cortisone and hydrocortisone.

In 1953, Julian founded his own research firm, Julian Laboratories, Inc. He brought many of his best chemists, including African-Americans and women, from Glidden to his own company. Julian won a contract to provide Upjohn with $2 million worth of progesterone To compete against Syntex, he would have to use the same Mexican yam Mexican barbasco trade as his starting material. Julian used his own money and borrowed from friends to build a processing plant in Mexico, but he could not get a permit from the government to harvest the yams. Abraham Zlotnik, a former Jewish University of Vienna classmate whom Julian had helped escape from the Holocaust, led a search to find a new source of the yam in Guatemala for the company.

Information Sourced From:

https://en.wikipedia.org/wiki/Percy_Lavon_Julian

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https://youtu.be/KSq__sdYNNk

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