Order	Reaction ID	Reaction
1	R00024	Vanillin + NAD<sup>+</sup> + H<sub>2</sub>O → Vanillic acid + NADH + 2H<sup>+</sup>
2	R00022	Vanillic acid + tetrahydrofolic acid → protocatechuic acid + 5-methyl-tetrahydrofolate