From the phytopathogenic fungus, Colletotrichum nicotianae, three phytotoxic substances have been isolated and named colletotrichin, colletotrichins B and C (1, 2 and 3). The struc tures of these compounds have been elucidated from the physical and chemical evidence. When applied on the tobacco leaves, colletotrichins induced the symptom similar to that of the tobacco anthracnose caused by C. nicotianae. The compounds were also toxic to the lettuce and rice seedlings. with C. nicotianae. 1 was identified to acetyl colletotriehin3> isolated from C. capsi by J. F. Grove through the comparison of physico chemical data of 1 with those of authentic sample kindly gifted by Dr. Grove. Because of the complexity and intimate relations in their structures, the structure determination of those compounds was made by the X-ray crystallographic analysis on the crystal of I along with the correlations of their structures. Just after accomplishment of the X-ray analysis, we noticed that J. MacMillan briefly reported the X-ray analysis on the acetyl derivative (4) of acetylcolletotrichin and changed the name of I to colletotrichin." Then the compounds of 2 and 3 were named as colletotrichins B and C, respectively. We have reported the structure elucidation of 1 and 2 preliminarily.' ' This paper deals with the details of isolation, structures and biological

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