PEG,1-phenyl-2,5,8,11-tetraoxatridecan-13-yl 4-methylbenzenesulfonate,Tosylate of Tetraethylene glycol monobenzyl ether

PEG,1-phenyl-2,5,8,11-tetraoxatridecan-13-yl 4-methylbenzenesulfonate,Tosylate of Tetraethylene glycol monobenzyl ether

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