
N9-Benzyl-substituted 1,3-dimethyl- and 1,3-dipropyl-pyrimido[2,1-f]purinediones: Synthesis and structure–activity relationships at adenosine A1 and A2A receptors
Keywords: Adenosine A1; A2A receptor antagonists; Pyrimido[2,1-f]purinediones; Tricyclic xanthine derivatives