Cercosporin, a deep purple pigment, was first isolated by Kuyama et al.1) in 1957 as a metabolite of Cercospora kikuchii [Matsu moto et Tomoyasu] Gardner, a pathogenic fungus of purple speck of japanese soybean.The chemical structure was elucidated by Lousberg et al.2) and Yamazaki,3) one of the present authors, quite independently as shown in 1 of Fig. 1.It was found to be a novel photodynamic pigment which reveals its photosensitizing effect on many organisms, such as
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Ōkubo et al. (1975) studied this question.