Sub Group: Nucleotides and Nucleosides Alphabetic Listing Catalog Number: 6978 Formula: C4H3N5O2?1/2H2O CAS Number: 1468-26-4 Molecular Weight: 162.1 Synonyms: 8-Aza-2,6-dihydroxypurine, Semihydrate, 3H-1,2,3-Triazolo(4,5-d)pyrimidine-5,7-diol