Diels-Alder reaction affords circumpyrene tetracarboxydiimide with excited state intramolecular charge transfer character. - Chen, Qiang; Guizzardi, Michele; Méndez, Francisco; Ju, Chengwei; Keller, Helena R.; Cerullo, Giulio; Osella, Silvio; Scotognella, Francesco; Paternò, Giuseppe M.; Müllen, Klaus; Narita, Akimitsu (Communications Chemistry, 2026)