Substituted methoxyphenyl-4,5 dihydro-3(2H)-pridazinones having cardiotonic and beta blocking activities

摘要

Pyridazinones of the following formula (I): <IMAGE> (I) where R1-R4 are a variety of substituents and L is a linking group, a pharmaceutical composition for treating congestive heart failure, novel intermediates, methods for such treatment and processes for preparing compounds of formula (I).