4I5I:
reference: The 2.5 A crystal structure of the SIRT1 catalytic domain bound to nicotinamide adenine dinucleotide (NAD+) and an indole (EX527 analogue) reveals a novel mechanism of histone deacetylase inhibition., Zhao X, Allison D, Condon B, Zhang F, Gheyi T, Zhang A, Ashok S, Russell M, MacEwan I, Qian Y, Jamison JA, Luz JG, J Med Chem. 2013 Feb 14;56(3):963-9. doi: 10.1021/jm301431y. Epub 2013 Jan 29. PMID: 23311358

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