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Haning H, Niewöhner U, Schenke T, Es-Sayed M, Schmidt G, Lampe T, Bischoff E. Imidazo[5,1- f ] [1,2,4] triazin-4(3 H )-ones, a new class of potent PDE 5 inhibitors. Bioorganic & Medicinal Chemistry Letters. 2002 Mar;12(6):865–8. doi: 10.1016/s0960-894x(02)00030-6. |