BNN6 is a thermoresponsive nitric oxide (NO) donor that often works by binding to a carrier. BNN6 decomposes under the heat stimulation generated by photothermal action, releasing high concentrations of NO, which exerts anti-tumor activity by inducing tumor cell apoptosis and inhibiting their repair. BNN6 can be used to synthesize the multifunctional biosensor BNN6-BiTiS3-iRGD, which exerts a synergistic anti-cancer effect with photothermal therapy (PTT) [1][2][3].