The chemical structure of abscisic acid was determined by

Letham

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Okhuma

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Yabuta

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P. Boysen-Jensen

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Solution

The correct option is B
Okhuma

In 1963, Ohkuma, Addicott, Eagles Wareing respectively in different countries extracted abscisic acid from cotton and maple leaf;

In 1965, Ohkuma used the ultraviolet spectrum, infrared spectrum and nuclear magnetic resonance spectrum and mass spectrometry to determine the surface chemical structural formula

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