butagest butagest butagest, also known as buterol, as well as 3β-hydroxy-6-methyl-17α-hydroxypregna-4,6-dien-20-one 3β-butanoate 17α-acetate or as 6-methyl-17α-hydroxy-δ6-progesterone 3β-butanoate 17α-acetate, is a steroidal progestin which was developed in russia for potential clinical use but was never marketed. it is a modification of megestrol acetate in which the c3 ketone has been replaced with a c3β butanoyloxy moiety. butagestclinical dataother namesbuterol; 17α-acetoxy-3β-butanoyloxy-6-methyl-pregna-4,6-dien-20-one; 17α-acetoxy-6-methyl-20-oxopregna-4,6-dien-3β-yl butyrate; 6-methyl-17α-hydroxy-δ6-progesterone 3β-butanoate 17α-acetatedrug classprogestogen; progestogen esteridentifiers iupac name phenanthren-3-yl] butanoate pubchem cid15816431chemspider21377535chemical and physical dataformulac28h40o5molar mass456.623 g·mol−13d model (jsmol)interactive image smiles cccc(=o)o1cc2(3cc4((3c=c(c2=c1)c)cc4(c(=o)c)oc(=o)c)c)c inchi inchi=1s/c28h40o5/c1-7-8-25(31)32-20-9-12-26(5)22-10-13-27(6)23(21(22)15-17(2)24(26)16-20)11-14-28(27,18(3)29)33-19(4)30/h15-16,20-23h,7-14h2,1-6h3/t20-,21+,22-,23-,26+,27-,28-/m0/s1key:vwkifebmjrfarl-naekrlsbsa-n