Suggested Reaction 1.1.5.-

Left

3,5,7,9,11,13,15-Heptaoxo-hexadecanoyl-[acp]
+CoQH2

Right

3,5,7,11,13,15-Heptaoxo-9-hydroxy-hexadecanoyl-[acp]
+CoQ

[BiSSCat | GREP ]