Suggested Reaction 1.3.1.-

Left

5,6-Dihydroxy-3-methyl-2-oxo-1,2,5,6-tetrahydroquinoline
+NAD+

Right

5,6-Dihydroxy-3-methyl-2-oxo-1,2-dihydroquinoline
+NADH
+H+

[BiSSCat | GREP ]