N-Fmoc-O-ethyl-L-homoserine is an homoserine derivative, can be used in cyclic peptide compounds synthesis, as a reducing reagent[1].
[1]. Muraoka T, et al. Preparation of cyclic peptide compounds having high membrane permeability by sell free translation or chemical synthesis, and library comprising them: World Intellectual Property Organization, WO2018225864[P]. 2018-12-13.