This phenolic compound crystallises as colourless needles that dissolve in water and alcohol. Found naturally in plant cell walls, it acts as an antioxidant and sees use in food preservation; microbes and enzymes can convert it into valuable aromatic compounds, notably the flavouring vanillin. Bound to arabinoxylans in cereal brans, it cross-links cell walls and contributes to dough properties; brewers know it as the precursor of 4-vinylguaiacol, the clove-like off-flavour of wheat beers. Bioconversion by engineered microbes turns this abundant agricultural residue into natural vanillin, commanding premium prices over synthetic routes.