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New plant growth regulators, named brevicompanines A 1 and B 2, have been isolated from Penicillium brevicompactum, and their structures have been established by spectroscopic methods including 2D NMR. The biological activities of 1 and 2 have been examined using bioassay methods with lettuce and rice seedlings.
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Kusano et al. (1998) studied this question.
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