Psoralen compounds are synthesized which have substitutions on the 4, 4', 5', and 8 positions of the psoralen, which permit enhanced binding to nucleic acid of pathogens. Higher psoralen binding levels and lower mutagenicity are described, resulting in safer, more efficient, and reliable inactivation...http://www.google.ca/patents/US6017691?utm_source=gb-gplus-sharePatent US6017691 - 4'-primary aminopsoralen and platelet compositions
