[C:1]([O:8][C:9]([O:11][C:12]([CH3:15])([CH3:14])[CH3:13])=[O:10])(OC(C)(C)C)=O.O.Cl.[OH:18][C:19]1[CH:26]=[CH:25][C:22]([CH:23]=[CH2:24])=[CH:21][CH:20]=1>N1C=CC=CC=1>[OH:18][C:19]1[CH:26]=[CH:25][C:22]([CH:23]=[CH2:24])=[CH:21][CH:20]=1.[C:12]([O:11][C:9]([O:8][C:1]1[CH:24]=[CH:23][C:22]([CH:25]=[CH2:26])=[CH:21][CH:20]=1)=[O:10])([CH3:13])([CH3:14])[CH3:15]In 40 ml of pyridine was dissolved poly p-hydroxystyrene (VP-8000, manufactured by Nippon Soda Co., Ltd., weight average molecular weight 1000), and 1.28 g of di-t-butyl dicarbonate was added to the solution with stirring at room temperature. After carrying out the reaction at room temperature for 3 hours, the reaction liquid was added to a solution of 1 liter of ion-exchanged water and 20 g of concentrated hydrochloric acid. The powder precipitated was collected by filtration, washed with water, and dried to obtain a p-hydroxystyrene/p-(t-butyloxycarbonyloxy)-styrene copolymer (60/40).
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