Task: Translation
Input (Czech): e en  se t²k  kompozice pro stabilizaci syntetick²ch polymer , kter  obsahuje alespo  jeden 3- (alkoxyfenyl)benzofuran-2-on obecn ho vzorce 1, ve kter m obecn  symboly maj  specifick  v²znamy, 3- (alkoxyfenyl)benzofuran-2-on  samotn²ch, jejich pou it  pro uvedenou stabilizaci a zp sobu stabilizace syntetick²ch polymer .\
Output (English): The present invention relates to a composition for stabilization of synthetic polymers, which composition contains at least one 3-(alkoxyphenyl)benzofuran-2-one of the general formula 1, in which the general symbols have specific meanings, the 3-(alkoxyphenyl)benzofuran-2-ones per se, their use for the indicated stabilization as well as a method for stabilization of synthetic polymers.