5-hydroxy-3,4-dimethylfuran-2(5H)-one;(Lactol der 2-Methyl-3-formyl-trans-buten-(2)-saeure);2(5H)-Furanone,5-hydroxy-3,4-dimethyl;2-hydroxy-3,4-dimethyl-5-oxo-2,5-dihydrofuran;5-hydroxy-3,4-dimethyl-5H-furan-2-one;4-hydroxy-2-butenolide;4-Hydroxy-2,3-dimethyl-buten-(2)-olid;