Cyclobuta[1,2-c:3,4-c']difuran-1,3,4,6-tetrone,tetrahydro-

1,2,3,4-cyclobutanetetracarboxylic dian& ; cyclobutane-1,2,3,4-tetracarboxylic dianhydride ,98% ; cyclobutane-1,2,3,4-tetracarboxylic ; maleic anhydride cyclic dimer. ; cyclobutanetetracarboxylic acid dianhydride ; 1,2,3,4-cyclobutanetetracarboxylic acid dianhydride ; cyclobutane-1,2,3,4-tetracarboxylic dianhydride ; cyclobutanetetracarboxylic dianhydride ; 1,2,3,4-cyclobutanetetracarboxylic dianhydride ; 4,9-dioxatricyclo[5.3.0.02,6]decane-3,5,8,10-tetrone