5-Isobenzofurancarboxylic acid, 1,3-dihydro-1,3-dioxo-, oxybis(methyleneoxymethylene) ester 69868-19-5 EINECS 274-178-5 Oxybis(methyleneoxymethylene) bis(1,3-dihydro-1,3-dioxoisobenzofuran-5-carboxylate) Trimellitic anhydride, tetraethylene glycol diester