gestaclone gestaclone gestaclone (inn, usan) (developmental code name sh-1040), also known as 6-chloro-1α,2α:16α,17-bismethylene-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. gestacloneclinical dataatc codenoneidentifiers iupac name (2ar,3as,3bs,3cs,5as,5bs,6as,7as,7bs)-5b-acetyl-9-chloro-3b,5a-dimethyl-2a,3,3a,3b,3c,4,5,5a,5b,6,6a,7,7a,7b-tetradecahydro-2h-cyclopropacyclopentacyclopropaphenanthren-2-one cas number19291-69-1pubchem cid11726670chemspider9901386uniiq4k0sc8tfychemical and physical dataformulac23h27clo2molar mass370.92 g·mol−13d model (jsmol)interactive image smiles o=c5\c=c4\c(\cl)=c/1(cc2(3(c(=o)c)(c12)c3)c)4(c)6c56 inchi inchi=1s/c23h27clo2/c1-11(25)23-10-12(23)6-16-13-8-19(24)18-9-20(26)14-7-17(14)22(18,3)15(13)4-5-21(16,23)2/h8-9,12-17h,4-7,10h2,1-3h3/t12-,13+,14+,15-,16-,17-,21-,22-,23-/m0/s1key:vuwysfaixuwqrq-vmkbgrnbsa-n