oxprenoate potassium oxprenoate potassium oxprenoate potassium (developmental code name ru-28318) is a synthetic steroidal antimineralocorticoid which was never marketed. the affinities of oxprenoate potassium for the steroid hormone receptors have been reported. oxprenoate potassiumclinical dataother namesru-28318; 17α-hydroxy-3-oxo-7α-propylpregn-4-ene-21-carboxylic acid monopotassium saltdrug classantimineralocorticoididentifiers iupac name potassium 3-phenanthren-17-yl]propanoate cas number76676-34-1pubchem cid23677972chemspider64295unii167ndd8mtechemical and physical dataformulac25h37ko4molar mass440.665 g·mol−13d model (jsmol)interactive image smiles ccc1cc2=cc(=o)cc2(314cc(4(cc3)c)(ccc(=o))o)c. inchi inchi=1s/c25h38o4.k/c1-4-5-16-14-17-15-18(26)6-10-23(17,2)19-7-11-24(3)20(22(16)19)8-12-25(24,29)13-9-21(27)28;/h15-16,19-20,22,29h,4-14h2,1-3h3,(h,27,28);/q;+1/p-1/t16-,19+,20+,22-,23+,24+,25-;/m1./s1key:hxjitugmcjckce-uyoqdffisa-m