Used for long-acting pegylation of biopharmaceuticals. Linear structure peg, seal one terminal by methoxy group, the other terminal is functional group, it could provide plenty pegylation options for protein drugs through diversified modification technology. Mpeg-sh methoxypoly(ethylene glycol) thiol Mpeg-sc methoxypoly(ethylene glycol) succinimidyl ester Mpeg-ma methoxypoly(ethylene glycol) methacrylate Mpeg-mal methoxypoly(ethylene glycol) maleimide Mpeg-nco methoxypoly(ethylene glycol) isocyanate Mpeg-eo methoxypoly(ethylene glycol) glycidyl ether Mpeg-cooh methoxypoly(ethylene glycol) carboxylic acid Mpeg-n3 methoxypoly(ethylene glycol) azide Mpeg-nh2 methoxypoly(ethylene glycol) amine Mpeg-alkyne methoxypoly(ethylene glycol) alkyne Mpeg-cho methoxypoly(ethylene glycol) aldehyde Mpeg-aa methoxypoly(ethylene glycol) acrylate Mpeg-oh methoxypoly(ethylene glycol)