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• 1XOS: catalytic domain of human phosphodiesterase 4b in complex with sildenafil (10.1016/J.STR.2004.10.004 )
• 3JWQ: crystal structure of chimeric pde5/pde6 catalytic domain complexed with sildenafil (10.1038/EMBOJ.2009.284 )
• 2H42: crystal structure of pde5 in complex with sildenafil (10.1074/JBC.M512527200 )
• 1UDT: crystal structure of human phosphodiesterase 5 complexed with sildenafil(viagra) (10.1038/NATURE01914 )
• 1TBF: catalytic domain of human phosphodiesterase 5a in complex with sildenafil (10.1016/J.MOLCEL.2004.07.005 )