What Swiss multinational healthcare company, introduced the steroidal progestin, Trengestone, in 1974?
Trengestone: Trengestone (INN) (brand names Reteroid, Retroid, Retrone; former developmental code name Ro 4-8347), also known as 6-chloro-6,7-didehydroretroprogesterone or 6-chloro-9β-10α-pregna-1,4,6-triene-3,20-dione, is a steroidal progestin of the retroprogesterone group related to dydrogesterone that was formerly used to treat menstrual disorders. Trengestone:  It was synthesized in 1964 and was introduced for medical use by Roche in 1974.
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