, of Mexico City, patented norethisterone, an oral progestational agent, which became the basis of later oral contraceptives.
A contraceptive tablet of phosphorated hesperedin was produced by G. D. Searle
's laboratories in Chicago.
Scientist Gregory Pincus
, working for G. D. Searle
, patented a compound very similar to synthetic oestrogen (first made in Syntex
labs nearly two years before) and set about using it, as Syntex