4AX9:
reference: Design and synthesis of potent and highly selective thrombin inhibitors., Hilpert K, Ackermann J, Banner DW, Gast A, Gubernator K, Hadvary P, Labler L, Muller K, Schmid G, Tschopp TB, et al., J Med Chem. 1994 Nov 11;37(23):3889-901. PMID: 7966150

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