hydromadinone hydromadinone hydromadinone (inn), also known as 6α-chloro-17α-hydroxyprogesterone, is a steroidal progestin of the 17α-hydroxyprogesterone group which was patented in 1967 but was never marketed. the c17α acetate ester of hydromadinone, hydromadinone acetate, also exists, but similarly was never marketed. hydromadinoneclinical dataatc codenoneidentifiers iupac name 6α-chloro-17α-hydroxypregn-4-ene-3,20-dione cas number16469-74-2pubchem cid216252chemspider187450unii3e4m0ppr7jchemblchembl2104256chemical and physical dataformulac21h29clo3molar mass364.91 g·mol−13d model (jsmol)interactive image smiles cc(=o)1(cc21(cc32c(c4=cc(=o)cc34c)cl)c)o inchi inchi=1s/c21h29clo3/c1-12(23)21(25)9-6-16-14-11-18(22)17-10-13(24)4-7-19(17,2)15(14)5-8-20(16,21)3/h10,14-16,18,25h,4-9,11h2,1-3h3/t14-,15+,16+,18+,19-,20+,21+/m1/s1key:imuizzgkyiluhz-scuqkffvsa-n