LG121071

LG121071 (or LGD-121071) is a selective androgen receptor modulator (SARM) developed by Ligand Pharmaceuticals that was first described in 1999 and was the first orally active nonsteroidal androgen to be discovered.[1][2] It is a tricyclic quinolone derivative, structurally distinct from other nonsteroidal AR agonists like andarine and enobosarm (ostarine).[2] The drug acts as a high-affinity full agonist of the androgen receptor (AR) (K_i = 17 nM),[2] with a potency and efficacy that is said to be equivalent to that of dihydrotestosterone (DHT).[3] Unlike testosterone, but similarly to DHT, LG121071 and other nonsteroidal androgens cannot be potentiated by 5α-reductase in androgenic tissues (nor aromatized into estrogenic metabolites), and for this reason, show tissue-selective androgenic effects.[4] In accordance, they are said to possess full anabolic activity with reduced androgenic activity, similarly to anabolic-androgenic steroids.[5]

LG121071

Clinical data
Other names	LG-121071; LGD-121071
Identifiers
IUPAC name 6-Ethyl-4-(trifluoromethyl)-1H,2H,6H,7H,8H,9H-pyrido[3,2-g]quinolin-2-one
CAS Number	179897-70-2
PubChem CID	9839132
ChemSpider	8014851
ChEMBL	ChEMBL390728
Chemical and physical data
Formula	C15H15F3N2O
Molar mass	296.293 g·mol^−1
3D model (JSmol)	Interactive image
SMILES CCC1CCNC2=C1C=C3C(=CC(=O)NC3=C2)C(F)(F)F
InChI InChI=1S/C15H15F3N2O/c1-2-8-3-4-19-12-7-13-10(5-9(8)12)11(15(16,17)18)6-14(21)20-13/h5-8,19H,2-4H2,1H3,(H,20,21) Key:SZPPQFARTYXRKU-UHFFFAOYSA-N

The in vitro metabolism of LG121071 has been characterized in anticipation of its possible use as a doping agent.[5][6]

See also

• Acetothiolutamide
• LG-120907
• LGD-2226
• LGD-3303
• S-40503

References

1. Hamann, Lawrence G.; Mani, Neelakandha S.; Davis, Robert L.; Wang, Xiao-Ning; Marschke, Keith B.; Jones, Todd K. (1999). "Discovery of a Potent, Orally Active, Nonsteroidal Androgen Receptor Agonist: 4-Ethyl-1,2,3,4-tetrahydro-6- (trifluoromethyl)-8-pyridono[5,6-g]- quinoline (LG121071)". Journal of Medicinal Chemistry. 42 (2): 210–212. doi:10.1021/jm9806648. ISSN 0022-2623. PMID 9925725.
2. Gao, Wenqing; Kim, Juhyun; Dalton, James T. (2006). "Pharmacokinetics and Pharmacodynamics of Nonsteroidal Androgen Receptor Ligands". Pharmaceutical Research. 23 (8): 1641–1658. doi:10.1007/s11095-006-9024-3. ISSN 0724-8741. PMC 2072875. PMID 16841196.
3. Chengalvala, Murty; Oh, Thomas; Roy, Arun K (2005). "Selective androgen receptor modulators". Expert Opinion on Therapeutic Patents. 13 (1): 59–66. doi:10.1517/13543776.13.1.59. ISSN 1354-3776.
4. Elbers JM, Grootenhuis AJ (2003). "New tissue-selective androgens: perspectives in the treatment of androgen deficits". Ann. Endocrinol. Paris. 64 (2): 183–8. PMID 12773961.
5. Knoop, Andre; Krug, Oliver; Vincenti, Marco; Schänzer, Wilhelm; Thevis, Mario (2015). "In vitro metabolism studies on the selective androgen receptor modulator (SARM) LG121071 and its implementation into human doping controls using liquid chromatography-mass spectrometry". European Journal of Mass Spectrometry. 21 (1): 27. doi:10.1255/ejms.1328. ISSN 1356-1049.
6. Gerace, E.; Salomone, A.; Fasano, F.; Costa, R.; Boschi, D.; Di Stilo, A.; Vincenti, M. (2010). "Validation of a GC/MS method for the detection of two quinolinone-derived selective androgen receptor modulators in doping control analysis". Analytical and Bioanalytical Chemistry. 400 (1): 137–144. doi:10.1007/s00216-010-4569-8. hdl:2318/86557. ISSN 1618-2642.