Patent ID: 6858736

Claim:
A novel hexa-arm polyethylene glycol (6-arm PEG) compound and its derivatives represented by the following formula (I): wherein, R 1 is a hydrogen atom, a hydroxyl group, alkyl group having 1 to 5 carbon atoms, an acrylate group, an acetaldehyde group, an epoxide group, a hydrazide group, a tresylate group, an alkylcarbonyl group or a phenylcarbonyl group having 1 to 10 carbon atoms which substituted by nitro group, primary, secondary or tertiary silane group which substituted by alkyl or alkoxy group having 1 to 5 carbon atoms, glutaric acid group, succinic acid group or CO(CH 2 ) m COONHS, m is an integer of 2 to 3, n is an integer of 20 to 2500.