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Vardenafil XP. Ballandstick model of vardenafil as bound to PDEA br using pymol org PyMOL accelrys html Accelrys DS Visualizer Pro and GIMP Optimized with Opti From PDB rcsb org cgi pdbId XP XP More information cite journal Card GL England BP Suzuki et al Structural basis for the activity of drugs that inhibit phosphodiesterases