Order	Reaction ID	Reaction
1	R00061	p-coumaric acid + CoA + ATP → p-coumaroyl-CoA + AMP + PPi
2	R00062	p-comaroyl-CoA + H<sub>2</sub>O → 4-hydroxybenzaldehyde + acetyl-CoA
3	R00038	4-hydroxybenzaldehyde + NADP<sup>+</sup> + H<sub>2</sub>O → 4-hydroxybenzoic acid + NADPH + 2 H<sup>+</sup>
4	R00037	4-hydroxybenzoic acid + NADPH + oxygen + H<sup>+</sup> → protocatechuic acid + NADP<sup>+</sup> + H<sub>2</sub>O