Suggested Reaction 1.3.4.-

Left

(15Z)-12-Oxophyto-10,15-dienoate
+1,4-Dithiothreitol

Right

8-[(1R,2R)-3-Oxo-2-{(Z)-pent-2-enyl}cyclopentyl]octanoate
+Oxidized dithiothreitol

[BiSSCat | GREP ]