Suggested Reaction 1.14.17.-

Left

trans-2-Methyl-5-isopropylhexa-2,5-dienoyl-CoA
+Vitamin C
+O2

Right

2,6-Dimethyl-5-methylene-3-oxo-heptanoyl-CoA
+Dehydroascorbate
+H2O

[BiSSCat | GREP ]