An amine-Reactive, Non-Fluorescent heterobifunctional, photoreactive crossslinker.Heterobifunctional photoreactive crosslinker. Succinimidyl ester will react with amines and the benzophenone will react non-specifically upon photoirradiation at approximately 360 nm. A benzophenone-based photoreactive reagent shown to be useful for synthesizing photoreactive peptides and oligonucleotides. An amine-Reactive, Non-Fluorescent heterobifunctional, photoreactive crossslinker