Z-NH-PEG
n
-CH
2
COOH
Z-NH-PEG
2
-CH
2
COOH (Z-AEEA)
Z-NH-PEG
3
-CH
2
COOH (Z-AEEEA)
Z-NH-PEG
5
-CH
2
COOH
Z-NH-PEG
8
-CH
2
COOH
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