Fmoc-L-Homoarg(Et)2-OH hydrochloride is a derivative of amino acid with protecting groups. Fmoc-L-Dap(Boc,Me)-OH can be used for synthesis of homoarginine containing peptide[1].
References
[1] Clemente C, et al., Biochemical characterization of a cyanobactin arginine-N-prenylase from the autumnalamide biosynthetic pathway. Chem Commun (Camb). 2022 Oct 27;58(86):12054-12057. DOI:10.1039/d2cc01799g