Order	Reaction ID	Reaction
1	R00027	catechol + O<sub>2</sub> → (2Z,4E)-2-hydroxy-6-oxohexa-2,4-dienoate + H<sup>+</sup>
2	R00028	"(2Z,4E)-2-hydroxy-6-oxohexa-2,4-dienoate + H<sub>2</sub>O → (2Z)-2-hydroxypenta-
2,4-dienoate + formic acid + H<sup>+</sup>"
3	R00029	"(2Z)-2-hydroxypenta-
2,4-dienoate + H<sub>2</sub>O → 4-hydroxy-2-oxopentanoate"
4	R00030	4-hydroxy-2-oxopentanoate → acetaldehyde + pyruvate
5	R00031	acetaldehyde + coenzyme A + NAD<sup>+</sup> → acetyl-CoA + NADH + H<sup>+</sup>