GLY-PHE-SER (S)-2-((S)-2-(2-aminoacetamido)-3-phenylpropanamido)-3-hydroxypropanoic acid REF DUPL: H-Gly-Phe-Ser-OH Glycyl-L-phenylalanyl-L-serine Glycylphenylalanylserine H-GLY-PHE-SER-OH L-Serine, glycyl-L-phenylalanyl- 2-[[2-[(2-aminoacetyl)amino]-3-phenylpropanoyl]amino]-3-hydroxypropanoic acid