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4-Amino-4H-1,2,4-triazole-3-thiol4343-75-3100 % similar 4-Amino-5-methyl-4H-1,2,4-triazole-3-thiol20939-15-533 % similar 4-Amino-5-(trifluoromethyl)-4H-1,2,4-triazole-3-thiol24848-20-231 % similar