The approach consisted in (i) reaction of glucose with glutamic acid (each 0.8 mol/L) in phosphate buffer (0.5 mol/L; pH 7) at 100.degree. C. for 30 min (step 1: generation of sugar fragments); (ii) reaction of cysteine (0.8 mol/L) in phosphate buffer (0.5 mol/L; pH 3) at 100.degree. C. for 6 hours (step 2: generation of cysteamine); and (iii) reaction of mixtures obtained in step 1 and 2 (mixed in ratio 1:1) at 100.degree. C. for 30 min at pH 7 (step 3: generation of odorants). Under these conditions, the yield of 2-AT was increased about twice (37 .mu.g/mol cys) and the yield of ADHT about 4 times (114 .mu.g/mol cys): FIG. 8.