Gestaclone (International Nonproprietary Name, INN, United States Adopted Name, USAN) (developmental code name SH-1040), also known as 6-chloro-1α,2α:16α,17-''bis''methylene-4,6-pregnadiene-3,20-dione, is a steroidal progestin of unique chemical structure derived from progesterone that was first described in 1967 and was never marketed.

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Diketones Organochlorides Pregnanes Progestogens Cyclopropanes {{genito-urinary-drug-stub