Melengestrol

Melengestrol
Clinical data
ATC code	None;
Identifiers
	IUPAC name 17α-hydroxy-6-methyl-16-methylenepregna-4,6-diene-3,20-dione;
CAS Number	5633-18-1 ;
PubChem CID	9906614;
ChemSpider	8082266 ;
UNII	BX98J4T6JU;
CompTox Dashboard (EPA)	DTXSID00204869 ;
ECHA InfoCard	100.024.613
Chemical and physical data
Formula	C23H30O3
Molar mass	354.490 g·mol−1
3D model (JSmol)	Interactive image;
	SMILES O=C4\C=C3\C(=C/[C@@H]1[C@H](CC[C@@]2([C@](O)(C(=C)\C[C@@H]12)C(=O)C)C)[C@@]3(C)CC4)C;
	InChI InChI=1S/C23H30O3/c1-13-10-17-18(21(4)8-6-16(25)12-19(13)21)7-9-22(5)20(17)11-14(2)23(22,26)15(3)24/h10,12,17-18,20,26H,2,6-9,11H2,1,3-5H3/t17-,18+,20+,21-,22+,23+/m1/s1 ; Key:OKHAOBQKCCIRLO-IBVJIVQJSA-N ;
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Melengestrol (INN, BAN) is a steroidal progestin of the 17α-hydroxyprogesterone group and an antineoplastic drug which was never marketed. An acylated derivative, melengestrol acetate, is used as a growth promoter in animals.

While melengestrol is sometimes used as a synonym for melengestrol acetate, what is usually being referred to is melengestrol acetate and not melengestrol.