Authentic samples of auxin‐a, auxin‐b and auxin‐a lactone ‐ discussed in papers from this laboratory in the period 1931‐1944 ‐ are found to be identical with cholic acid, thiosemicarbazide and hydroquinone, respectively. Auxin glutaric acid turns out to be phthalic acid, and the 3,5‐dinitrobenzoyl ester of auxin‐b is ethyl α‐cyanophenylpyruvate. Auxins a and b, as unique individuals, are therefore to be considered as non‐existent.
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Vliegenthart et al. (1966) studied this question.
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