4,4'-(1,2-dioxoethane-1,2-diyl)dibenzaldehyde InChI=1/C16H10O4/c17-9-11-1-5-13(6-2-11)15(19)16(20)14-7-3-12(10-18)4-8-14/h1-10 benzaldehyde, 4,4'-(1,2-dioxo-1,2-ethanediyl)bis-