Suggested Reaction 1.14.11.-

Left

3-Carboxy-2,5-dihydro-5-oxofuran-2-acetate
+O2
+2-Ketoglutaric acid

Right

4-Carboxy-2-hydroxyhexa-2,4-dienedioate
+CO2
+Butanedionic acid
[BiSSCat | GREP ]