A pharmaceutically acceptable salt of a 4 amino-5-cyanopyrimidine derivative

Abstract

The present invention provides 4-amino-5 cyanopyrimidine derivatives of the formula:wherein R1, R2 and R3 are defined herein, or pharmaceutically acceptable salts thereof, having a safe and potent adenosine A2a receptor agonistic activity; and also provides an adenosine A2a receptor agonist, an intraocular pressure reducing agent, or a medicine for treating glaucoma, etc., which comprises the compound as an active ingredient.