megestrol caproate megestrol caproate megestrol caproate, abbreviated as mgc, is a progestin medication which was never marketed. it was developed in russia in 2002. in animals, mgc shows 10-fold higher progestogenic activity compared to progesterone when both are administered via subcutaneous injection. in addition, mgc has no androgenic, anabolic, or estrogenic activity. the medication was suggested as a potential contraceptive and therapeutic agent. not to be confused with megestrol acetate. megestrol caproateclinical dataother namesmgc; megestrol hexanoate; megestrol 17α-caproate; 17α-hydroxy-6-dehydro-6-methylprogesterone 17α-caproate; 17α-hydroxy-6-methylpregna-4,6-diene-3,20-dione 17α-caproatedrug classprogestin; progestogen; progestogen esteridentifiers iupac name phenanthren-17-yl] hexanoate pubchem cid23265655chemspider10420418chemical and physical dataformulac28h40o4molar mass440.624 g·mol−13d model (jsmol)interactive image smiles cccccc(=o)o1(cc21(cc32c=c(c4=cc(=o)cc34c)c)c)c(=o)c inchi inchi=1s/c28h40o4/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/h16-17,21-23h,6-15h2,1-5h3/t21-,22+,23+,26-,27+,28+/m1/s1key:xdvhixrjlwukrr-orztvlamsa-n chemistry