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https://www.techtransfer.nih.gov/patent/e-248-2004-0-jp-08 PURINE DERIVATIVES AS A3 AND A1 ADENOSINE RECEPTOR AGONISTS | Technology Transfer adenosine receptor agonists purine derivatives technology transfer https://www.scielo.org.mx/scielo.php?script=sci_arttext&pid=S1870-249X2010000400009&lng=es&nrm=iso Synthesis and Antithyroid Activity of Some 8-Substituted Purine Derivatives purine derivatives synthesis activity substituted