Used as a chiral ligand in asymmetric catalysis, particularly in enantioselective organic transformations. It forms complexes with metal ions such as copper(II), enabling highly stereoselective cyclopropanation, Diels-Alder, and aziridination reactions. Its rigid pyridine-bisoxazoline (PYBOX) framework enhances stereocontrol, making it valuable in the synthesis of optically active pharmaceuticals and fine chemicals. The phenyl and sulfonyl substituents fine-tune electronic and steric properties, improving catalyst performance and enantioselectivity in various C–C and C–heteroatom bond-forming reactions.