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Ukita T, Nakamura Y, Kubo A, Yamamoto Y, Moritani Y, Saruta K, Higashijima T, Kotera J, Fujishige K, Takagi M, Kikkawa K, Omori K. 1,7- and 2,7-naphthyridine derivatives as potent and highly specific PDE5 inhibitors. Bioorganic & Medicinal Chemistry Letters. 2003 Jul;13(14):2341–5. doi: 10.1016/s0960-894x(03)00440-2. |