RolipramCyclic Nucleotide Phosphodiesterases, Type 4Phosphodiesterase Inhibitors3',5'-Cyclic-AMP PhosphodiesterasesPyrrolidinonesCyclic AMPCyclic Nucleotide Phosphodiesterases, Type 3Purinones4-(3-Butoxy-4-methoxybenzyl)-2-imidazolidinoneCyclic AMP-Dependent Protein KinasesCyclic Nucleotide Phosphodiesterases, Type 1ColforsinPhosphoric Diester HydrolasesBucladesinePyridazines8-Bromo Cyclic Adenosine MonophosphateAdenylate Cyclase1-Methyl-3-isobutylxanthineDose-Response Relationship, Drug