3-Cl-Pyridine-amide-acrylaldehyde-piperazine serves as a synthetic intermediate for LO-4-25. LO-4-25 is a ligand for the androgen receptor (AR) DNA binding domain and is linked to a truncated fumaramide handle via a connector. In 22Rv1 cells, LO-4-25 demonstrates potent degradation of both AR and AR-V7.