Asperlactone

(5R)-5-[(1S)-1-Hydroxyethyl]-3-[(2S,3S)-3-methyl-2-oxiranyl]-2(5H)-furanone

[5R,(+)]-5-[(S)-1-Hydroxyethyl]-3-[(2S)-3-methyloxirane-2-yl]furan-2(5H)-one