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2,4-Dichlorophenoxyacetate-grown cells of Alcaligenes eutrophus JMP134 [1] metabolized 4-methylphenoxyacetate via a modified ortho-cleavage pathway. 4-Carboxymethyl-4-methylbut-2-en-1,4-olide (4-methyl-2-enelactone), 4-carboxymethyl-3-methylbut-2-en-1,4-olide (3-methyl-2-enelactone) and 4-methyl-3-oxoadipate, were identified as intermediates.
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Pieper et al. (1985) studied this question.
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