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Novel inhibitor of PD-1/PD-L1 (IC 50 value of 56.58 nM), dose-dependently promoting HepG2 cell death in a co-culture model of HepG2/hPD-L1 and Jurkat T cells, effectively inhibiting tumor growth (TGI of 76.4% at 90 mg/kg) in an immune checkpoint humanized mouse model with no obvious toxicity