6-amino-3-(4-chlorophenyl)-2H-1,2,4-triazin-5-one

6-amino-3-methylsulfanyl-2H-1,2,4-triazin-5-one

6-amino-3-tert-butyl-2H-1,2,4-triazin-5-one

6-amino-3,4-dimethyl-1,2,4-triazin-5-one

6-amino-4-methyl-3-methylsulfanyl-1,2,4-triazin-5-one