LLC355 is a discoidin domain receptor 1 (DDR1) ATTEC degrader. It efficiently degrades DDR1 protein, with a DC50 value of 150.8 nM in non-small cell lung cancer NCI-H23 cells. LLC355 induces DDR1 degradation via lysosome-mediated autophagy and effectively inhibits the tumorigenicity, migration, and invasion of cancer cells.