4-(tert-Butoxycarbonyloxy)styrene-4-hydroxystyrene copolymer 4-(tert-Butoxycarbonyloxy)styrene-p-hydroxystyrene copolymer 4-Hydroxystyrene-4-(tert-butoxycarbonyloxy)styrene copolymer Carbonic acid, 1,1-dimethylethyl 4-ethenylphenyl ester, polymer with 4-ethenylphenol p-(tert-Butyloxycarbonyloxy)styrene-p-hydroxystyrene copolymer p-Hydroxystyrene-4-tert-butoxycarbonyloxystyrene copolymer p-Hydroxystyrene-p-(tert-butoxycarbonyloxy)styrene copolymer p-tert-Butoxycarbonyloxystyrene-p-hydroxystyrene copolymer Phenol, 4-ethenyl-, polymer with 1,1-dimethylethyl 4-ethenylphenyl carbonate tert-Butoxycarbonyloxystyrene-p-hydroxystyrene copolymer