1NO9:
reference: Design of weakly basic thrombin inhibitors incorporating novel P1 binding functions: molecular and X-ray crystallographic studies., De Simone G, Menchise V, Omaggio S, Pedone C, Scozzafava A, Supuran CT, Biochemistry 2003 Aug 5;42(30):9013-21. PMID: 12885234

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