KW 3902 is an antagonist of the adenosine A1 receptor (Ki = 0.19 nM). It displays 890-fold selectivity for A1 receptors over A2A receptors and has no activity at A3 receptors. KW 3902 less potently inhibits human organic anion transporter 1 (OAT1; Ki = 7.82 μM). KW 3902 exhibits renal protective effects during hypoxemia in rabbits.
