allyltestosterone allyltestosterone allyltestosterone, or 17α-allyltestosterone, also known as 17α-allylandrost-4-en-17β-ol-3-one, is a steroid derived from testosterone that was first synthesized in 1936 and was never marketed. along with propyltestosterone (topterone), it has been patented as a topical antiandrogen and hair growth inhibitor. allyltestosterone is the parent structure of two marketed 19-nortestosterone progestins, allylestrenol and altrenogest. these progestins are unique among testosterone derivatives in that they appear to be associated with few or no androgenic effects. allyltestosteroneclinical dataother names17α-allyltestosterone; 17α-allylandrost-4-en-17β-ol-3-oneidentifiers iupac name (8r,9s,10r,13s,14s,17r)-17-hydroxy-10,13-dimethyl-17-prop-2-enyl-2,6,7,8,9,11,12,14,15,16-decahydro-1h-cyclopentaphenanthren-3-one cas number98169-58-5pubchem cid22808244chemspider58190189unii54hm6o0ygkchemical and physical dataformulac22h32o2molar mass328.496 g·mol−13d model (jsmol)interactive image smiles c12cc3(ccc4=cc(=o)cc34c)1cc2(o)cc=c inchi inchi=1s/c22h32o2/c1-4-10-22(24)13-9-19-17-6-5-15-14-16(23)7-11-20(15,2)18(17)8-12-21(19,22)3/h4,14,17-19,24h,1,5-13h2,2-3h3/t17-,18+,19+,20+,21+,22-/m1/s1key:dfrqhishxqpkmu-veyvbmqysa-n