Suggested Reaction 6.4.1.-

Left

2-Hydroxy-6-oxo-7-methylocta-2,4-dienoate
+ATP
+Acid carbonate

Right

2-Hydroxy-3-carboxy-6-oxo-7-methylocta-2,4-dienoate
+ADP
+Orthophosphate
[BiSSCat | GREP ]