6J21:
reference: Human substance P receptor binding mode of the antagonist drug aprepitant by NMR and crystallography., Chen S, Lu M, Liu D, Yang L, Yi C, Ma L, Zhang H, Liu Q, Frimurer TM, Wang MW, Schwartz TW, Stevens RC, Wu B, Wuthrich K, Zhao Q, Nat Commun. 2019 Feb 7;10(1):638. doi: 10.1038/s41467-019-08568-5. PMID: 30733446

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