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2-Hydroxymuconate semialdehyde is formed from catechol by the enzyme catechol 2,3-dioxygenase during the degradation of benzoates. It is hydrolysed into formate and 2-oxopent-4-enoate by 2-hydroxymuconate-semialdehyde hydrolase.
References
2-Hydroxymuconate semialdehyde Wikipedia(Text) CC BY-SA