Synonyms:
bis(2,4,6-tri-tert-butylphenyl)pentaerythritol-di-phosphite ; 3,9-bis[2,4,6-tris(1,1-dimethylethyl)phenoxy]-2,4,8,10-tetraoxa-3,9-diphosphaspiro[5.5]undecane ; ultranox 633 ; bis(2,4,6-tri-ter-butyllphenyl)pentaerythritol-di-phosphite ; 4-isocyanato-n,n-bis(4-isoyanatophenyl)-2,5-dimethoxy-benz.