algestone algestone algestone (inn), also known as alphasone or alfasone, as well as dihydroxyprogesterone, is a progestin which was never marketed. another progestin, algestone acetophenide, in contrast, has been marketed as a hormonal contraceptive. algestoneclinical dataother namesdihydroxyprogesterone; dhp; alfasone; alphasone; neo-alfasol; 16α,17α-dihydroxyprogesterone; 16α,17α-dihydroxypregn-4-ene-3,20-dione; alphasone; alfasonedrug classprogestin; progestogenatc codenonelegal statuslegal status in general: ℞ (prescription only) identifiers iupac name (8r,9s,10r,13s,14s,16r,17s)-17-acetyl-16,17-dihydroxy-10,13-dimethyl-2,6,7,8,9,11,12,14,15,16-decahydro-1h-cyclopentaphenanthren-3-one cas number595-77-7pubchem cid11687chemspider11196unii3jeb53b3wtchebichebi:763 ycomptox dashboard (epa)dtxsid40208200 echa infocard100.008.974 chemical and physical dataformulac21h30o4molar mass346.467 g·mol−13d model (jsmol)interactive image smiles o=c4\c=c2/(1cc3((o)(c(=o)c)(o)c31cc2)c)(c)cc4 inchi inchi=1s/c21h30o4/c1-12(22)21(25)18(24)11-17-15-5-4-13-10-14(23)6-8-19(13,2)16(15)7-9-20(17,21)3/h10,15-18,24-25h,4-9,11h2,1-3h3/t15-,16+,17+,18-,19+,20+,21-/m1/s1key:cxdwhyobsjtrju-srwwvfqwsa-n chemistry