154974-43-3 2,4-(Hydroxy-3,5-ditributylphenyl)-2-aminomalonic acid Amino(3,5-bis(1,1-dimethylethyl)-4-hydroxyphenyl)propanedioic acid Anfen Anphen Propanedioic acid, amino(3,5-bis(1,1-dimethylethyl)-4-hydroxyphenyl)-