4A6C:
reference: Synthesis, X-ray analysis, and biological evaluation of a new class of stereopure lactam-based HIV-1 protease inhibitors., Wu X, Ohrngren P, Joshi AA, Trejos A, Persson M, Arvela RK, Wallberg H, Vrang L, Rosenquist A, Samuelsson BB, Unge J, Larhed M, J Med Chem. 2012 Mar 22;55(6):2724-36. Epub 2012 Mar 13. PMID: 22376008

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