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1H NMR spectra of PD-L1 with terphenyl-based inhibitors. (A) 1H NMR spectra of the aliphatic part of human PD-L1 protein (blue) with compound 4a (red), 7a (green), 7e (purple), and 8j (orange) in the molar ratio 1:1. (B,C) Aliphatic region of PD-L1 (blue) with 8j (red): human PD-L1 (panel B) and mouse PD-L1 (panel C) in the molar ratio 1:1 and 1:10, respectively.
