PYRIDAZINONE COMPOUND AS ADENOSINE ANTAGONISTS

摘要

A compound of the following formula (I): wherein R?1, R2, R3 and R4¿ are each independently hydrogen or a suitable substituent, in which R?1 and R2¿ together or R?2 and R3¿ together may form -(CH¿2?)n- (wherein n is an integer of 1 to 12) which is optionally interrupted by heteroatom(s) and optionally having suitable substituent(s); andW is , or ,or a salt thereof.The compound of the above formula (I) and a salt thereof are adenosine antagonists and are useful as medicaments.