the selective ions of the 10 s-triazines investigated ( simazine , atrazine , propazine , terbuthylazine , cyanazine , desmetryne , ametryne , prometryne , terbutryne and methoprotryne ) were chosen on the basis of an electron impact mass spectrometry study of the s-triazine standards and the whole mass spectra are given .
C0040877
triazines
C0033407
prometryne