medroxyprogesterone caproate medroxyprogesterone caproate medroxyprogesterone caproate (mpc) is a progestin and a progestogen ester which was synthesized in 1958 but was never marketed. it has been confused with hydroxyprogesterone caproate (ohpc) and medroxyprogesterone acetate (mpa) in a number of publications. in addition to mpa and ohpc, analogues of mpc include chlormadinone caproate, gestonorone caproate, megestrol caproate, and methenmadinone caproate. not to be confused with hydroxyprogesterone caproate or medroxyprogesterone acetate. medroxyprogesterone caproateclinical dataother namesmpc; medroxyprogesterone capronate; medroxyprogesterone hexanoate; 6α-methyl-17α-hydroxyprogesterone hexanoate; 6α-methyl-17α-hydroxypregn-4-ene-3,20-dione hexanoateroutes ofadministrationintramuscular injectiondrug classprogestogen; progestin; progestogen esteridentifiers iupac name phenanthren-17-yl] hexanoate cas number6678-23-5pubchem cid62997chemspider56699uniignc5bcm98acomptox dashboard (epa)dtxsid00216902 chemical and physical dataformulac28h42o4molar mass442.640 g·mol−13d model (jsmol)interactive image smiles cccccc(=o)o1(cc21(cc32c(c4=cc(=o)cc34c)c)c)c(=o)c inchi inchi=1s/c28h42o4/c1-6-7-8-9-25(31)32-28(19(3)29)15-12-23-21-16-18(2)24-17-20(30)10-13-26(24,4)22(21)11-14-27(23,28)5/h17-18,21-23h,6-16h2,1-5h3/t18-,21+,22-,23-,26+,27-,28-/m0/s1key:rdnjgiawtamggm-upiziacdsa-n