PIPES sesquisodium Salt PIPES sesquisodium Salt Synonyms: 1,4-Piperazinediethanesulfonic acid sesquisodium salt; Piperazine-N,N'-bis(2-ethanesulfonic acid) sesquisodium salt CAS NO.: 100037-69-2 Formula: C8H17N2O6S2-.C8H16N2O6S2-2.3[Na+] Weight: 670.68222