1,1-Dimethylmethanetricarboxylic Acid 1-Phenyl Ester is an intermediate used in the synthesis of Dimethyl 2-Hydroxymalonate (D468325), which is a building block used in various chemical synthesis, and a derivative of Tartronic acids which best known as a reactant in the catalytic oxidation with air to form mesoxalic acid, another type of hydroxydicarboxylic acid.