4,5,6,7-Tetrahydropyrazolo[1,5-a]pyrazine dihydrochloride; CAS No.:165894-07-5; 4,5,6,7-Tetrahydropyrazolo[1,5-a]pyrazine dihydrochloride. ChemShuttle, a chemical synthesis company, provides various building blocks. The compound 4,5,6,7 - Tetrahydropyrazolo[1,5 - a]pyrazine dihydrochloride (CAS No.:165894-07-5) is one of the building blocks. It can be used in the synthesis of various organic compounds. Building blocks are fundamental units that can be combined to create new molecules with specific properties. ChemShuttle's building blocks collection is extensive and diverse to support various research and industrial applications.