Characterization of 8-(N-methylisopropyl) amino-N6-(5’-endohydroxy-endonorbornyl)-9-methyladenine (WRC-0571), a highly potent and selective, non-xanthine antagonist of A1 adenosine receptors - Martin, P; Wysocki, R; Barrett, R (J Pharmacol Exp Ther, 1996)