17-hydroxy-3,6,9,12,15-pentaoxaheptadecan-1-oic acid

Hydroxy-PEG5-methyl ester

methyl 1-hydroxy-3,6,9,12-tetraoxapentadecan-15-oate

methyl 3-(2-hydroxyethoxy)propanoate

(S)-but-3-en-2-ol

Dde Biotin-PEG4-DBCO

DBCO-S-S-PEG3-Biotin

DBCO-S-S-NHS ester

四聚乙二醇-单十六醚

巯基-十二聚乙二醇-羧酸