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ERA-63

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ERA-63
Clinical data

Other names	3-Methylene-7α-methylethinylestradiol; 3-Methylene-7α-methyl-17α-ethynylestra-5(10)-en-17β-ol^[1]
Identifiers
IUPAC name (7R,8R,9S,13S,14S,17R)-17-Ethynyl-7,13-dimethyl-3-methylidene-1,2,4,6,7,8,9,11,12,14,15,16-dodecahydrocyclopenta[a]phenanthren-17-ol
PubChem CID	87921126
ChemSpider	8058857
Chemical and physical data
Formula	C₂₂H₃₀O
Molar mass	310.481 g·mol⁻¹
3D model (JSmol)	Interactive image
SMILES C[C@@H]1CC2=C(CCC(=C)C2)[C@@H]3[C@@H]1[C@@H]4CC[C@]([C@]4(CC3)C)(C#C)O
InChI InChI=1S/C22H30O/c1-5-22(23)11-9-19-20-15(3)13-16-12-14(2)6-7-17(16)18(20)8-10-21(19,22)4/h1,15,18-20,23H,2,6-13H2,3-4H3/t15-,18-,19+,20-,21+,22+/m1/s1 Key:ITYURVXIFIQGDB-LADQHVHVSA-N

ERA-63, also known as ORG-37663, as well as 3-methylene-7α-methyl-17α-ethynylestra-5(10)-en-17β-ol, is a synthetic, steroidal estrogen and a selective agonist of the ERα that was under development for the treatment of rheumatoid arthritis but was never marketed.^[2]^[1] The drug produced estrogenic effects but failed to show effectiveness for rheumatoid arthritis in a phase IIa clinical study.^[3]^[4] A large clinical trial also found that prinaberel (ERB-041), a selective ERβ agonist, was ineffective in the treatment of rheumatoid arthritis in spite of activity in preclinical models.^[4]

References[edit]

^ ^a ^b Janssen GB, Penninks AH, Knippels LM, van Zijverden M, Spanhaak S (2008). "The evaluation of the immunomodulating properties of ERA-63 a pharmaceutical with estrogenic activity". Toxicol. Lett. 180 (3): 196–201. doi:10.1016/j.toxlet.2008.06.857. PMID 18602456.

^ Dulos J, Hofstra CL, Joosten L, Veening-Griffioen DH, Lucassen MA, Doorn CM, Graaf JH, Miltenburg A, Dijcks FA, Ederveen TH, Boots AM (2006). "A selective estrogen receptor alpha agonist (Org 37663) suppresses inflammation and arthritis in mouse models". Annals of the Rheumatic Diseases. 65: 128.

^ van Vollenhoven RF, Houbiers JG, Buttgereit F, In 't Hout J, Boers M, Leij S, Kvien TK, Dijkmans BA, Szczepański L, Szombati I, Sierakowski S, Miltenburg AM (2010). "The selective estrogen receptor alpha agonist Org 37663 induces estrogenic effects but lacks antirheumatic activity: a phase IIa trial investigating efficacy and safety of Org 37663 in postmenopausal female rheumatoid arthritis patients receiving stable background methotrexate or sulfasalazine". Arthritis Rheum. 62 (2): 351–8. doi:10.1002/art.27196. PMID 20112368.