UDP-galactose can donate is sugar residue to glucose to form the disaccharide lactose. For the structures of UDP-galactose and glucose below, indicate the reactive electrophilic and nucleophilic centers and the products of the reaction.

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HOCH2 HOCH HO O, H OT 0 он н он н O-P-O-P-O-Uridine HO он H HO 0 нон UDP-galactose Glucose