2-Hydroxy-4-methoxybenzaldehyde Tags: Chemical Compound, Chemical Substance.2-Hydroxy-4-methoxybenzaldehyde is a chemical compound and an isomer of vanillin. Urolithin M7 one of the urolithins has also been synthesized from 2-hydroxy-4-methoxybenzaldehyde using the inverse electron-demand Diels–Alder reaction. thumbnail IUPAC name 2-Hydroxy-4-methoxybenzaldehyde Learn more... Loading...