RolipramCyclic Nucleotide Phosphodiesterases, Type 4FosfodiesterashämmarePyrrolidinoner3´5´-cyklisk nukleotidfosfodiesterasCyclic Nucleotide Phosphodiesterases, Type 3PurinonerCykliskt AMPRo 20-1724Cyclic Nucleotide Phosphodiesterases, Type 1FosfordiesterhydrolaserPyridaziner1-metyl-3-isobutylxantin