[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.[CH:18]#[C:19][C:20]1[CH:25]=[CH:24][C:23]([OH:26])=[CH:22][CH:21]=1>N1C=CC=CC=1>[OH:26][C:23]1[CH:24]=[CH:25][C:20]([CH:19]=[CH2:18])=[CH:21][CH:22]=1.[C:12]([O:11][C:9]([O:8][C:1]1[CH:22]=[CH:21][C:20]([CH:25]=[CH2:24])=[CH:19][CH:18]=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: 11,000) and to the solution was added 1.28 g of di-tert-butyl dicarbonate at a room temperature with stirring. The solution was reacted at a room temperature for 3 hours and poured into a solution of one liter of ion-exchanged water and 20 g of concentrated hydrochloric acid. The powder thus-deposited was collected by filtration, washed with water and dried to obtain p-hydroxystyrene/p-(tert-butoxycarbonyloxy)-styrene (60/40) copolymer. The Mw of the resin was 12,000 and the molecular weight distribution (Mw/Mn) thereof was 1.1.
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