Compounds were resolved in the following conditions: helium flow,1.0 mL/min;
oven temperature, 50C (2 min), 6C/min to 180C (1 min), then
6C/min to 260C (5 min); and mass spectrometer monitoring in
full scan mode (m/z 35e550) operated in the electron ionization
mode at 70 eV with a source temperature of 220C. Compounds
were tentatively identified by the mass spectra using the National
Institute of Standards and Technology database.