. "Phosphodiesterase (PDE) inhibitor" . "phosphodiester" . "Phosphodiesterase inhibitor" . "phosphodiesterase" . . "Inhibitors of PDE" . . . "inhibition of phosphodiesterases" . "PDE inhibitor" . "PDE inhibitors" . "PDE_10A inhibitor" . "phosphodiesterase inhibitor" . "Phosphodiesterase inhibitor" . "PDE₄ inhibitor" . . "inhibitor" .