氨基PEG羧基 NH2-PEG-COOH ... ...
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羧基COOH修饰PEG
p1Src=//y1.yzimgs.com/uploads/484807/2016220-171554922.jpg?watermark/2/text/5LiK5rW36IqD56GV55Sf54mp56eR5oqA5pyJ6ZmQ5YWs5Y-4/font/5a6L5L2T/fontsize/400/fill/I0E3QTlBOA==/gravity/SouthEast"