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![]() Date: 2011-09-23 22:11:32Lactams Piperazines Eli Lilly and Company Tadalafil Organochlorides Vardenafil Sildenafil Cyclic guanosine monophosphate CGMP-specific phosphodiesterase type 5 Chemistry Organic chemistry PDE5 inhibitors | Document is deleted from original location. Download Document from Web Archive |