SEARCH Articles Figures Tables 1 ,2 ,3,4 -Tetrahydro-2 ,4 -dioxo 1,2,4-Triazine 3.5- dioxo-2,3,4,-5-tetrahydro 1- Methyl-4,5,6,7-tetrahydro 1.2.4- Triazines, 1,2,3,6-tetrahydro 2.4- Dioxo 3.5- Dioxo-2,3,4,5-tetrahydro-1,2,4-triazin 5- Methyl-1,2,4-triazines Methylation triazine