Melengestrol acetate

Melengestrol acetate
Clinical data
Trade names	Heifermax, MGA
Other names	MGA; MLA; MLGA; Melengesterol acetate; Methylsuperlutin; U-21240; BDH-1921; 17α-Acetoxy-16-methylene-6-methyl-6-dehydroprogesterone; 17α-Acetoxy-16-methylene-6-methylpregna-4,6-diene-3,20-dione
Drug class	Progestogen; Progestin; Progestogen ester
ATC code	None;
Identifiers
	IUPAC name [(8R,9S,10R,13S,14S,17R)-17-acetyl-6,10,13-trimethyl-16-methylidene-3-oxo-1,2,8,9,11,12,14,15-octahydrocyclopenta[a]phenanthren-17-yl] acetate;
CAS Number	2919-66-6;
PubChem CID	250948;
DrugBank	DB14659;
ChemSpider	219803;
UNII	4W5HDS3936;
KEGG	D04900;
CompTox Dashboard (EPA)	DTXSID5048184 ;
ECHA InfoCard	100.018.964
Chemical and physical data
Formula	C25H32O4
Molar mass	396.527 g·mol−1
3D model (JSmol)	Interactive image;
	SMILES O=C4\C=C3\C(=C/[C@@H]1[C@H](CC[C@@]2([C@](OC(=O)C)(C(=C)\C[C@@H]12)C(=O)C)C)[C@@]3(C)CC4)C;
	InChI InChI=1S/C25H32O4/c1-14-11-19-20(23(5)9-7-18(28)13-21(14)23)8-10-24(6)22(19)12-15(2)25(24,16(3)26)29-17(4)27/h11,13,19-20,22H,2,7-10,12H2,1,3-6H3/t19-,20+,22+,23-,24+,25+/m1/s1; Key:UDKABVSQKJNZBH-DWNQPYOZSA-N;

Melengestrol acetate (MLGA), sold under the brand names Heifermax and MGA among others, is a progestin medication which is used in animal reproduction. It is not approved for use in humans, and is instead used as an implantable contraceptive for captive animals in zoos and other refuges, and is also used as a feed additive to promote growth in cattle, a purpose it is licensed for in the United States and Canada.