**Design and Characterization of pH-Responsive Amino-Acid-Functionalized Perylene Diimide Derivatives for Lysosome-Targeted Anticancer Therapy**
The development of effective strategies to combat multidrug-resistant (MDR) cancers remains a critical challenge in oncology. In this study, a series of amino-acid-functionalized perylene diimide (PDI-AA) derivatives—PDI-Asp, PDI-Ala, and PDI-5AVA—were…