Psoralen compound compositions are synthesized which have substitutions on the 4, 4', 5', and 8 positions of the psoralen, which yet permit their binding to nucleic acid of pathogens. Reaction conditions that photoactivate these bound psoralens result in covalent crosslinking to nucleic acid, thereby...http://www.google.ca/patents/US5654443?utm_source=gb-gplus-sharePatent US5654443 - Compounds for the photo decontamination of pathogens in blood
