Themass spectra were obtained by means of a mass selective detector
working in electronic impact at 70 eV, a multiplier voltage of 1650
and collecting data at a rate of 1.4104 scan/sec over the range 36–
360 uma. Compounds were identified by comparing their mass spectra
with reference spectra from the NIST 2005 version 2.0 spectral library
database (National Institute of Standards and Technology, Gaithersburg)
and Kovats retention Index (Kovats, 1965).