Suggested Reaction 1.1.1.-

Left

9-Hydroxy-3,5,7,11,13,15,17,19-nonaoxo-henicosanoyl-[acp]
+NAD+

Right

3,5,7,9,11,13,15,17,19-Nonaoxo-henicosanoyl-[acp]
+NADH
+H+

[BiSSCat | GREP ]