estradiol propoxyphenylpropionate estradiol propoxyphenylpropionate estradiol propoxyphenylpropionate (eppp), sold under the brand name durovex, is an estrogen medication and estrogen ester which is no longer marketed. it is the c17β propoxyphenylpropionate (propoxyhydrocinnamate) ester of estradiol. it is a long-acting depot estrogen. estradiol propoxyphenylpropionateclinical datatrade namesdurovexother nameseppp; estradiol 17-(4-propoxyphenyl)propanoate; estradiol p-propoxyhydrocinnamateroutes ofadministrationintramuscular injectiondrug classestrogen; estrogen esteridentifiers iupac name phenanthren-17-yl] 3-(4-propoxyphenyl)propanoate cas number7724-88-1pubchem cid90479312chemspider34995669unii288oer048nchemical and physical dataformulac30h38o4molar mass462.630 g·mol−13d model (jsmol)interactive image smiles cccoc1ccc(ccc(=o)o2cc34ccc5cc(o)ccc54cc23c)cc1 inchi inchi=1s/c30h38o4/c1-3-18-33-23-9-4-20(5-10-23)6-15-29(32)34-28-14-13-27-26-11-7-21-19-22(31)8-12-24(21)25(26)16-17-30(27,28)2/h4-5,8-10,12,19,25-28,31h,3,6-7,11,13-18h2,1-2h3/t25-,26-,27+,28+,30+/m1/s1key:jnwiusbbfnmzrq-bojcflqhsa-n