Potent and selective phosphodiesterase (PDE4) inhibitor, IC50=0.7, 0.9, 0.7, 0.2 nM for PDE4A1, PDE4A4, PDE4B1 and PDE4B2 respectively1. Clinically useful agent for treatment of COPD2. Improves sensory gating in humans3 and improves memory in rodent mode
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