GC/MS analysis was carried out in a Hewlett-Packard GC (ModelNo. 5995) coupled with mass spectrometer under the following conditions: GC column and conditions were the same as in the capillary GC analysis. MS conditions were as follows: electron impact as the ion source, ionizing voltage 70 eV, source temperature 150◦C,electron multiplier at 2000 eV, scan speed 690 amu/s, and scan range 40–500 amu.