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Home › Theophylline and 3-isobutyl-1 methylxanthine based N-7 substituted derivatives displaying inhibitory activities on PDE-5 phospodiesterase

Theophylline and 3-isobutyl-1 methylxanthine based N-7 substituted derivatives displaying inhibitory activities on PDE-5 phospodiesterase

US Patent 7550468 · Granted Jun 23, 2009

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