HP-136; 2(3H)-Benzofuranone, 5,7-bis(1,1-dimethylethyl)-3-hydroxy-, reaction products with o-xylene; Reaction product of 5,7-bis(1,1-dimetylethyl)-3-hydroxy-2(3H)-benzofuranone with o-xylene; 3,4-Dibutyl-5-(2,4-dimethylphenyl)benzofuran-2(3H)-one; 5,7-di-tert-butyl-3-(3,4-dimethylphenyl)-1-benzofuran-2(3H)-one