1HVH:
reference: Nonpeptide cyclic cyanoguanidines as HIV-1 protease inhibitors: synthesis, structure-activity relationships, and X-ray crystal structure studies., Jadhav PK, Woerner FJ, Lam PY, Hodge CN, Eyermann CJ, Man HW, Daneker WF, Bacheler LT, Rayner MM, Meek JL, Erickson-Viitanen S, Jackson DA, Calabrese JC, Schadt M, Chang CH, J Med Chem 1998 Apr 23;41(9):1446-55. PMID: 9554878

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