17α-bromoprogesterone 17α-bromoprogesterone 17α-bromoprogesterone (17α-bp) is a progestin which was first described in 1957 and was never marketed. it is about twice as potent as progesterone in terms of progestogenic activity in animal bioassays. 17α-bp is a parent compound of haloprogesterone (6α-fluoro-17α-bromoprogesterone) and 6α-methyl-17α-bromoprogesterone. 17α-bromoprogesteroneclinical dataother names17α-bp; 17α-bromopregn-4-ene-3,20-dionedrug classprogestogen; progestinidentifiers iupac name (8r,9s,10r,13s,14s,17r)-17-acetyl-17-bromo-10,13-dimethyl-2,6,7,8,9,11,12,14,15,16-decahydro-1h-cyclopentaphenanthren-3-one cas number28449-24-3pubchem cid68524848uniiybt8y54z9pchemical and physical dataformulac21h29bro2molar mass393.365 g·mol−13d model (jsmol)interactive image smiles cc(=o)1(cc21(cc32ccc4=cc(=o)cc34c)c)br inchi inchi=1s/c21h29bro2/c1-13(23)21(22)11-8-18-16-5-4-14-12-15(24)6-9-19(14,2)17(16)7-10-20(18,21)3/h12,16-18h,4-11h2,1-3h3/t16-,17+,18+,19+,20+,21+/m1/s1key:ienasmftjrlbjp-cegnmafcsa-n