Suggested Reaction 3.3.2.-

Left

9-Hydroxy-3,5,7,11,13,15,17-octaoxo-nonadecanoyl-[acp]
+H2O

Right

9-Hydroxy-3,5,7,11,13,15,17-octaoxo-octadecanoyl-[acp]
+Methanol

[BiSSCat | GREP ]