Spectrum Chemical manufactures and distributes fine chemicals with quality you can count on including those with CAS number 58-93-5, Whether you call it Hydrochlorothiazide or 6-Chloro-3 -4-dihydro-2H-1 -2 -4-benzothiadiazine-7-sulfonamide 1 -1-Dioxide you can be assured the products offered by Spectrum, meet or exceed the grade requirements or specifications for each individual product.