2J4I:
reference: Structure- and property-based design of factor Xa inhibitors: pyrrolidin-2-ones with acyclic alanyl amides as P4 motifs., Young RJ, Campbell M, Borthwick AD, Brown D, Burns-Kurtis CL, Chan C, Convery MA, Crowe MC, Dayal S, Diallo H, Kelly HA, King NP, Kleanthous S, Mason AM, Mordaunt JE, Patel C, Pateman AJ, Senger S, Shah GP, Smith PW, Watson NS, Weston HE, Zhou P, Bioorg Med Chem Lett. 2006 Dec 1;16(23):5953-7. Epub 2006 Sep 18. PMID: 16982190

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