However, the compositions of bio oil from Para rubber seed could be estimated for the primary molecular formula by Ozlem Onay and O.Mete Kockar method. [8] This method assumed another element from Table 2 was oxygen so the elemental compositions of bio oil from shell contained C 55.14%, H 6.74%, N 0.24% and O 37.88%. Finally, the bio oil from shell showed the primary molecular formula as CH1.47 N0.004 O0.52 and CH1.68 N0.047 O0.08 for bio oil from residue.