2-Hy­droxy-3-meth­oxy­methyl-5-methyl­benzaldehyde

In the title mol­ecule, C₁₀H₁₂O₃, all non-H atoms lie in a common plane (r.m.s deviation = 0.010 Å). The mol­ecular conformation is stabilized by an intra­molecular O—H...O hydrogen bond.