Suggested Reaction 1.1.5.-

Left

3,5,7,9,11,13,15-Heptaoxo-heptadecanoyl-[acp]
+Reduced thioredoxin

Right

3,5,7,11,13,15-Heptaoxo-9-hydroxy-heptadecanoyl-[acp]
+Oxidized thioredoxin

[BiSSCat | GREP ]