4-(N-Succinimidylcarboxy)benzophenone is a photoactive reagent specifically designed for biochemical research. Its molecule contains both succinimide ester groups and benzophenone structures. It can be used to explore the binding sites between proteins and proteins, as well as between proteins and nucleic acids, and to lock the transient interaction complexes through light-controlled cross-linking. It can also assist in the preparation of stable antigen-antibody conjugates, providing reliable materials for biochemical detection, molecular recognition and other experiments.