Synonyms: 1,4-Benzenedicarboxylic acid, dimethyl ester, polymer with 1,4-butanediol and .alpha.-hydro-.omega.-hydroxypoly(oxy-1,4-butanediyl);1,4-Benzenedicarboxylic acid, dimethyl ester, polymer with 1,4-butanediol and 伪-hydro-蠅-hydroxypoly( oxy-1,4-butanediyl)