4EH2:
reference: Natural-product-derived fragments for fragment-based ligand discovery., Over B, Wetzel S, Grutter C, Nakai Y, Renner S, Rauh D, Waldmann H, Nat Chem. 2012 Dec 18;5(1):21-8. doi: 10.1038/nchem.1506. Epub 2012 Dec 2. PMID: 23247173

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