6XTA:
reference: Structure-activity relationship study of tryptophan-based butyrylcholinesterase inhibitors., Meden A, Knez D, Malikowska-Racia N, Brazzolotto X, Nachon F, Svete J, Salat K, Groselj U, Gobec S, Eur J Med Chem. 2020 Aug 22;208:112766. doi: 10.1016/j.ejmech.2020.112766. PMID: 32919297

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