?2-Methyltetrahydrofuran-3-one (CAS NO.3188-00-9), its Synonyms are 2-Methyl-2H-furan-3-one ; 2-Methyl-3-ketotetrahydrofuran ; 2-Methyl-3-oxotetrahydrofuran ; 2-Methyl-4,5-dihydro-3(2H)-furanone ; 3(2H)-Furanone, dihydro-2-methyl- ; Dihydro-2-methyl-3(2H)-furanone ; Dihydro-2-methyl-3-furanone .