Tamibarotene [AM 80, retinobenzoic acid, Amnoid™, Tamibaro] is a novel synthetic retinoid that is in development with Nippon Shinyaku as a potential treatment for acute promyelocytic leukaemia (APL) and is pending approval in Japan. Tamibarotene was being developed by Shionogi in Japan but the company subsequently discontinued its involvement. Various nonindustrial sources, such as the University of Tokyo, Japan, have also played a role in the development of tamibarotene.Nippon Shinyaku has licensed the rights to tamibarotene from Toko Pharmaceutical Industries for the treatment of acute promyelocytic leukaemia, according to Nippon Shinyaku's June 2004 pipeline update. However it is unclear when Toko Pharmaceutical Industries acquired rights to the compound.