11β-Methoxyestradiol

11β-Methoxyestradiol
Clinical data
Other names	11β-MeOE2; 11βOMeEST; RU-2504; 11β-Methoxyestra-1,3,5(10)-triene-3,17β-diol
Drug class	Estrogen
Identifiers
	IUPAC name (8S,9S,11S,13S,14S,17S)-11-methoxy-13-methyl-6,7,8,9,11,12,14,15,16,17-decahydrocyclopenta[a]phenanthrene-3,17-diol;
CAS Number	21507-14-2 ;
PubChem CID	68568;
ChemSpider	61838;
UNII	R3M9HHJ34D;
ChEMBL	ChEMBL368703;
CompTox Dashboard (EPA)	DTXSID80878441 ;
Chemical and physical data
Formula	C19H26O3
Molar mass	302.414 g·mol−1
3D model (JSmol)	Interactive image;
	SMILES C[C@]12C[C@@H]([C@H]3[C@H]([C@@H]1CC[C@@H]2O)CCC4=C3C=CC(=C4)O)OC;
	InChI InChI=1S/C19H26O3/c1-19-10-16(22-2)18-13-6-4-12(20)9-11(13)3-5-14(18)15(19)7-8-17(19)21/h4,6,9,14-18,20-21H,3,5,7-8,10H2,1-2H3/t14-,15-,16-,17-,18+,19-/m0/s1; Key:OAHDOJSNKCCHJM-VIUKOLAESA-N;

11β-Methoxyestradiol (11β-MeOE2; developmental code name RU-2504) is a synthetic steroidal estrogen which was never marketed. It has about 86% of the relative binding affinity of estradiol for the estrogen receptor. 11β-MeOE2 is structurally related to moxestrol (11β-methoxy-17α-ethynylestradiol). 11β-MeOE2 and moxestrol are substantially more potent than their non-methoxylated analogues (estradiol and ethinylestradiol, respectively) in mice.