Flavor ingredient; found naturally in cocoa, coffee, filberts, almonds, and peanuts. Prepn: G. Gennari, Gazz. Chim. Ital. 24, 246 (1894); C. C. Price et al., J. Am. Chem. Soc. 63, 1857 (1941) DOI; and heat of vaporization: J. H. Mathews, P. R. Fehlandt, ibid. 53, 3212 (1931) DOI. Toxicological profile: D. L. J. Opdyke, Food Cosmet. Toxicol. 17, Suppl., 869 (1979) DOI.