4-amino-3-hydrazino-5-mercapto-1 2 4-triazol July 8, 2019 16 32 64 128 4-amino-3-hydrazino-5-mercapto-1 2 4-triazole 4-amino-3-hydrazino-5-mercapto-1 2 4-triazole sigma 3-amino-5-mercapto-1 2 4-triazole 2-amino-5-mercapto-1 3 4-thiadiazole 5-amino-4h-1 2 4-triazole-3-thiol 4-amino-1 2 4-triazole