2902-64-9 5-Isobenzofurancarboxylic acid, 1,3-dihydro-1,3-dioxo-, methyl ester EINECS 220-796-5 Methyl 1,3-dihydro-1,3-dioxo-5-isobenzofurancarboxylate Methyl 1,3-dihydro-1,3-dioxoisobenzofuran-5-carboxylate Trimellitic anhydride methyl ester