cingestol cingestol cingestol (inn, usan) (former tentative brand name lutisan), also known as 17α-ethynylestr-5-en-17β-ol, is a steroidal progestin of the 19-nortestosterone group that was never marketed. it was synthesized in 1969 and was developed in the 1970s by organon as a low-dose, progestogen-only contraceptive, but in 1984, was still described as "under investigation". the drug is an isomer of lynestrenol with the double bond between c5 and c6. cingestolclinical datatrade nameslutisanother names19-nor-17α-pregn-5-en-20-yn-17β-ol; o.v. 28routes ofadministrationoralidentifiers iupac name (8r,9s,10r,13s,14s,17r)-17-ethynyl-13-methyl-2,3,4,7,8,9,10,11,12,14,15,16-dodecahydro-1h-cyclopentaphenanthren-17-ol cas number16915-71-2pubchem cid11954351chemspider10128646uniivlj9702j11comptox dashboard (epa)dtxsid70168666 echa infocard100.037.225 chemical and physical dataformulac20h28omolar mass284.443 g·mol−13d model (jsmol)interactive image smiles c12cc3(cc=c4cccc34)1cc2(o)c#c inchi inchi=1s/c20h28o/c1-3-20(21)13-11-18-17-9-8-14-6-4-5-7-15(14)16(17)10-12-19(18,20)2/h1,8,15-18,21h,4-7,9-13h2,2h3/t15-,16+,17+,18-,19-,20-/m0/s1key:hsywfjbhxiuucz-xgxhktljsa-n