1,3-Benzenedicarboxylic acid, polymer with 1,4-butanediol and dimethyl 1,4-benzenedicarboxylate 1,4-Benzenedicarboxylic, dimethyl ester, 1,3-benzenedicarboxylic acid, 1,4-butanediol polymer 1,4-Butanediol, dimethyl terephthalate, isophthalic acid polymer 36008-14-7