PEGylated Amino Acids PEGylated Amino Acids Boc-NH-PEGn-CH2CH2COOH (8) Fmoc-NH-PEGn-CH2CH2COOH (15) Fmoc-NH-PEGn-CH2COOH (7) Z-NH-PEGn-CH2CH2COOH (8) Z-NH-PEGn-CH2COOH (4)