6I9A:
reference: Structural determinants of inhibition of Porphyromonas gingivalis gingipain K by KYT-36, a potent, selective, and bioavailable peptidase inhibitor., Guevara T, Rodriguez-Banqueri A, Lasica AM, Ksiazek M, Potempa BA, Potempa J, Gomis-Ruth FX, Sci Rep. 2019 Mar 20;9(1):4935. doi: 10.1038/s41598-019-41354-3. PMID: 30894633

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