(-)-Quercuslactone b

(4S,5S)-4-Methyl-5-butyltetrahydrofuran-2-one

(3S,4S)-4-Hydroxy-3-methyloctanoic acid 1,4-lactone

(Z)-whiskeylactone,5-butyldihydro-4-methyl-2(3H)-Furanone,(-)-cis-whiskeylactone