Suggested Reaction 1.1.4.-

Left

11beta,21-Dihydroxy-3,20-oxo-5beta-pregnan-18-al
+1,4-Dithiothreitol

Right

3alpha,11beta,21-Trihydroxy-20-oxo-5beta-pregnan-18-al
+Oxidized dithiothreitol

[BiSSCat | GREP ]