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3-Amino-5-mercapto-1,2,4-triazole 3-Methyl-1,2,4-triazolo[4,3-a]pyrazine 8-CHLORO-3-(TRIFLUOROMETHYL)[1,2,4]TRIAZOLO[4,3-A]PYRAZINE 3-(Trifluoromethyl)-1,2,4-triazolo[4,3-a]pyrazine 8-CHLORO-3-METHYL-[1,2,4]TRIAZOLO[4,3-A]PYRAZINE 8-CHLORO-3-ETHYL-[1,2,4]TRIAZOLO[4,3-A]PYRAZINE 1,2,4-TRIAZOLO[4,3-A]PYRAZINE-3-CARBOXYLIC ACID, ETHYL ESTER