progesterone dioxime progesterone dioxime progesterone dioxime, or progesterone 3,20-dioxime (p4-3,20-do), also known as 3,20-di(hydroxyimino)pregn-4-en-3-one, is a progesterone derivative which was never marketed. it is a progestogen oxime – specifically, the c3 and c20 dioxime of the progestogen progesterone. progesterone c3 and c20 oxime conjugates have been found to be water-soluble prodrugs of progesterone and pregnane neurosteroids. not to be confused with progesterone oxime. progesterone dioximeclinical dataother namesprogesterone 3,20-dioxime; p4-3,20-do; pregn-4-ene-3,20-dione 3,20-dioxime; 3,20-di(hydroxyimino)pregn-4-en-3-oneidentifiers iupac name (nz)-n-phenanthren-17-yl]ethylidene]hydroxylamine cas number26144-38-7pubchem cid91692079chemspider7875670chemical and physical dataformulac21h32n2o2molar mass344.499 g·mol−13d model (jsmol)interactive imagemelting point238–242 °c (460–468 °f) (recrystallized from alcohol) smiles c/c(=n/o)/1cc21(cc32ccc4=c/c(=n/o)/cc34c)c inchi inchi=1s/c21h32n2o2/c1-13(22-24)17-6-7-18-16-5-4-14-12-15(23-25)8-10-20(14,2)19(16)9-11-21(17,18)3/h12,16-19,24-25h,4-11h2,1-3h3/b22-13-,23-15+/t16-,17+,18-,19-,20-,21+/m0/s1key:jkenirseialbgx-gwubatfgsa-n