39457-08-4;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-��-hydroxypoly( oxy-1,4-butanediyl)
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