Suggested Reaction 1.14.17.-

Left

4,4-Dimethyl-5alpha-cholest-7-en-3beta-ol
+Vitamin C
+O2

Right

4beta-Hydroxymethyl-4alpha-methyl-5alpha-cholest-7-en-3beta-ol
+Dehydroascorbate
+H2O
[BiSSCat | GREP ]