（1）Motif can design PDC types

· Cell-penetrating peptides (CPPs), cell-targeting peptides (CPTs), self-assembling peptides (SAPs), and reactive peptides.

（2）Advantages of PDC drug synthesis

· The smaller size of the molecule makes it a higher drug carrying capacity, and it is easier to penetrate the tumor stroma and penetrate deep into the tumor cells, thus delivering drugs more effectively;

· It is highly biodegradable, which means that it does not cause immunogenic reactions in the body, increasing the safety of treatment;

· Some targeted peptides can eliminate drug resistance of tumor cells by changing the cell entry mechanism of drugs, and achieve effective killing of drug-resistant tumors;

· The short peptide characteristic of PDC makes its structure more flexible and convenient for modification and coupling operation;

· The production process of the fragment is relatively simple and easy to achieve large-scale production;

（3）Advantages of Motif PDC drug synthesis