Allosteric potentiator at the adenosine A1 receptor; acts via agonist-dependent and -independent mechanisms. Enhances agonist affinity for, and increased t? of dissociation from, the receptor. Also inhibits basal and forskolin-stimulated adenylyl cyclase (AC) activity in A1 receptors expressed in CHO cells, possibly via direct potentiation of constitutive receptor activity or by direct inhibition of AC. Active in vivo. Purity 99%. MW (observed): 299.31