FC131 TFA is a CXCR4 antagonist, inhibits [125I]-SDF-1 binding to CXCR4, with an IC50 of 4.5 nM. Anti-HIV activity[1]. IC50: 4.5 nM ([125I]-SDF-1-CXCR4)[1]HIV-1[1]
[1]. Tamamura H, et al. Stereoselective synthesis of [L-Arg-L/D-3-(2-naphthyl)alanine]-type (E)-alkene dipeptide isosteres and its application to the synthesis and biological evaluation of pseudopeptide analogues of the CXCR4 antagonist FC131. J Med Chem. 2005 Jan 27;48(2):380-91.