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Three new okaramine congeners, okaramines D (1), E (2), and F (3), were isolated from okara fermented with a strain of Penicillium simplicissimum ATCC 90288, and their structures were determined by spectroscopic methods. Okaramine D exhibited insecticidal activity against silkworms, but the other compounds showed no such activity.
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Hayashi et al. (1995) studied this question.
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