Doubly N-confused porphyrins as efficient sensitizers for singlet oxygen generation - Araki, Koiti; Engelmann, Fábio Monaro; Mayer, Ildemar; Toma, Henrique Eisi; Baptista, Maurício da Silva; Maeda, Hiromitsu; Osuka, Atsuhiro; Furuta, Hiroyuki (Chemistry Letters, 2003)