RolipramCyclic Nucleotide Phosphodiesterases, Type 4Phosphodiesterase 4 InhibitorsPhosphodiesterase Inhibitors3',5'-Cyclic-AMP PhosphodiesterasesPyrrolidinonesCyclic Nucleotide Phosphodiesterases, Type 3Phosphodiesterase 3 InhibitorsCyclic AMPCyclic AMP-Dependent Protein KinasesColforsinIsoenzymesDose-Response Relationship, Drug