2,4-Di-(tert-butyl)-6-(5-chloro-2H-benzo[d][1,2,3]triazol-2-yl)phenol-d18; 2,4-Di-tert-butyl-6-(5-chlorobenzotriazol-2-yl)phenol-d18; 2-(2-Hydroxy-3,5-di-tert-butylphenyl)-5-chloro-2H-benzotriazole-d18; 2-(2-Hydroxy-3,5-di-tert-butylphenyl)-5-chlorobenzotriazole-d18; 2-(2'-Hydroxy-3',5'-di-tert-butylphenyl)-5-chlorobenzotriazole-d18; 2-(3,5-Di-tert-butyl-2-hydroxyphenyl)-5-chloro-2H-benzotriazole-d18; 2-(3,5-Di-tert-butyl-2-hydroxyphenyl)-5-chlorobenzotriazole-d18; 2-(3',5'-Di-tert-butyl-2'-hydroxyphenyl)-5