Abstract Six new compounds have been identified in the volatile fractions produced during the submerged cultivation of Streptomyces avermitilis. By recording the GC/MS, GC/FTIR, CD, 1 H and 13 C NMR data and by performing chemical degradation experiments, these compounds were determined to be (5S, S)-5-methyl-3-(methylalkyl) furan-2 (5H)-ones. Herein, the existence of volatile lactones with an anteiso structure of the side-chain is thus ...
