The 1 H NMR spectrum is shown in Figure and it is consistent with previous works , where the 18-hydroxy-9,10-epoxy octadecanoic acid was the primary fraction of fatty acid extracted from the bark ( 13 C NMR spectrum in Figure chain unsaturation in the 18-hydroxyoctadec-9-enoic acid. Furthermore, the peak at 3.43 ppm ( 1 H NMR) and 34.52 ppm ( 13 C NMR)