Synthesis and Evaluation of Polycyclic Pyrazolo[3,4-<i>d</i>]pyrimidines as PDE1 and PDE5 cGMP Phosphodiesterase Inhibitors

Yan Xia(Stanford University), Hongtao Zhang(Chinese Academy of Sciences), Samuel Chackalamannil, Henry Vaccaro, Hsingan Tsai, John S. Cook, Ahmad Fawzi, Reneé Cleven, Robert W. Watkins, Michael Czarniecki(Merck & Co., Inc., Rahway, NJ, USA (United States))
Journal of Medicinal Chemistry
December 1, 1997
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