甲氧基聚乙二醇-羧基,97% average Mw2000
甲氧基聚乙二醇-羧基,97% average Mw1000
甲氧基聚乙二醇-羧基,97% average Mw5000
甲氧基聚乙二醇-羧基,97% average Mw10000
甲氧基聚乙二醇-羧基,97% average Mw20000