r. 2-(or 5)-Ethyl-5-(or 2)-methyl-4-hydroxy-3(2H)-furanone also has a sweet caramel flavour with a lower threshold (0.02 ppm) than the dimethyl compound
r. 2 (or 5) - Ethyl - 5 (or 2) -methyl-4-hydroxy-3 (2H) -furanone also has a sweet caramel flavor with a lower threshold (0.02 ppm) than dimethyl case tight