4QFL:
reference: Structural insights into the multispecific recognition of dipeptides of deep-sea gram-negative bacterium Pseudoalteromonas sp. strain SM9913., Li CY, Chen XL, Qin QL, Wang P, Zhang WX, Xie BB, Su HN, Zhang XY, Zhou BC, Zhang YZ, J Bacteriol. 2015 Mar;197(6):1125-34. doi: 10.1128/JB.02600-14. Epub 2015 Jan 20. PMID: 25605306

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