4H-Pyrimido(2,1-b)benzothiazole-3-carboxamide, 6,7,8,9-tetrahydro-4-oxo-N-1H-tetrazol-5-yl-, sodium salt, hydrate (1:1:3) 79932-79-9 N-(5-Tetrazolyl)-1-oxo-1H-cyclohexenothiazolo(3,2-a)pyrimidine-2-carboxamide sodium trihydrate