progesterone 3-oxime progesterone 3-oxime progesterone 3-oxime (p4-3-o), also known as 3-(hydroxyimino)pregn-4-en-3-one, is a progesterone derivative which was never marketed. it is a progestogen oxime – specifically, the c3 oxime of the progestogen progesterone. progesterone c3 and c20 oxime conjugates, like progesterone 3-(o-carboxymethyl)oxime, have been found to be water-soluble prodrugs of progesterone and pregnane neurosteroids. not to be confused with progesterone 20-oxime. progesterone 3-oximeclinical dataother namesprogesterone 3-oxime; p4-3-o; pregn-4-ene-3,20-dione 3-oxime; 20-(hydroxyimino)pregn-4-en-3-oneidentifiers iupac name 1-((8s,9s,10r,13s,14s,17s,e)-3-(hydroxyimino)-10,13-dimethyl-2,3,6,7,8,9,10,11,12,13,14,15,16,17-tetradecahydro-1h-cyclopentaphenanthren-17-yl)ethan-1-one cas number51652-28-9chemical and physical dataformulac21h30no2molar mass328.476 g·mol−13d model (jsmol)interactive image smiles o=c(c)1cc2()1(c)cc3()2()ccc4=c/c(cc34c)=n/o inchi inchi=1s/c21h31no2/c1-13(23)17-6-7-18-16-5-4-14-12-15(22-24)8-10-20(14,2)19(16)9-11-21(17,18)3/h12,16-19,24h,4-11h2,1-3h3/b22-15+/t16-,17+,18-,19-,20-,21+/m0/s1key:fpsimalnsftztf-mjrgjnicsa-n