NCIt definition : The hydrochloride salt form of amotosalen, a synthetic psoralen and light-activated
DNA, RNA crosslinking agent, with protective activity against pathogens such as bacteria,
viruses, protozoa, and leukocytes. Prior to administration amotosalen is added to
plasma and platelets, then in vivo the agent penetrates pathogens and targets DNA
and RNA. Upon activation by ultraviolet A light, this agent is able to form interstrand
DNA and RNA crosslinks and prevents replication. Inactivation of leukocytes can prevent
graft versus host disease upon transfusion.;