derive from a mid-chain diol in the 9,10,18-hydroxy octadecanoic acid. Interestingly, the signals within the 4.05 -4.18 ppm 1 H NMR region derive from mono and/or diacyl glycerol structures , highlighting the presence of oligomeric structures remaining after the alkaline treatment. Such a hypothesis is further supported by the signal at 4.85 ppm ( 1 H NMR), which is assigned to a secondary ester bond and used as an indicator of the esterification reaction in the next paragraph. Table contains the 1 H and C NMR chemical shifts.