EINECS 220-796-5, 4-Carbomethoxyphthalic anhydride, methyl 1,3-dihydro-1,3-dioxoisobenzofuran-5-carboxylate, Trimellitic anhydride methyl ester, Benzol-1,2,4-tricarbonsaeure-1,2-anhydrid-4-methylester, 1,2,4-benzenetricarboxylic anhydride methyl ester, 4-methoxycarbonylphthalic anhydride, Methyl 1,3-dihydro-1,3-dioxo-5-isobenzofurancarboxylate, benzene-1,2,4-tricarboxylic acid-1,2-anhydride-4-methyl ester, 1,3-dioxo-1,3-dihydro-isobenzofuran-5-carboxylic acid methyl ester