acetomepregenol acetomepregenol acetomepregenol (acm), also known as mepregenol diacetate and sold under the brand name diamol, is a progestin medication which is used in russia for the treatment of gynecological conditions and as a method of birth control in combination with an estrogen. it has also been studied in the treatment of threatened abortion. it has been used in veterinary medicine as well. it has been marketed since at least 1981. acetomepregenolclinical datatrade namesdiamolother namesacm; mepregenol diacetate; diamol; megestrol diacetate; megestrol 3β,17α-diacetate; 3β,17α-diacetoxy-6-methylpregna-4,6-dien-20-one; 6-methylpregna-4,6-dien-3β,17α-diol-20-one diacetatedrug classprogestogen; progestin; progestogen esteridentifiers iupac name phenanthren-3-yl] acetate cas number3116-07-2pubchem cid197015chemspider170630unii1ji0g99bdocomptox dashboard (epa)dtxsid40953248 chemical and physical dataformulac26h36o5molar mass428.569 g·mol−13d model (jsmol)interactive image smiles cc1=cc2c(ccc3(c2ccc3(c(=o)c)oc(=o)c)c)c4(c1=cc(cc4)oc(=o)c)c inchi inchi=1s/c26h36o5/c1-15-13-20-21(24(5)10-7-19(14-23(15)24)30-17(3)28)8-11-25(6)22(20)9-12-26(25,16(2)27)31-18(4)29/h13-14,19-22h,7-12h2,1-6h3/t19-,20+,21-,22-,24+,25-,26-/m0/s1key:sdhhpvpfuvqwky-avhyyfbhsa-n pharmacology based on its chemical structure, namely the lack of a c3 ketone, it is probable that acetomepregenol is a prodrug of megestrol acetate (the 3-keto analogue). chemistry