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Transesterification reaction of lactose with divinyladipate in pyridine catalyzed by an alkaline protease from Bacillus subtilis at 50℃ for 3 days gave 6′-O-vinyladipoyl-lactose (yield 35%).Poly (6′-O-vinyladipoyl-lactose) with Mn=21,200,Mw=32,900,Mw/Mn=1