2 amino 5 methyl 1 3 4 thiadiazole July 8, 2019 16 32 64 128 2-amino-5-ethyl-1 3 4-thiadiazole 2-amino-5-ethylthio-1 3 4-thiadiazole 2-amino-5-mercapto-1 3 4-thiadiazole
