(4S,5R)-5-butyl-4-methyloxolan-2-one;(4S,5R)-5-butyl-4-methyl-tetrahydrofuran-2-one;(4S,5R)-5-butyl-4-methyl-2-tetrahydrofuranone;(4S,5R)-5-butyl-4-methyl-oxolan-2-one
(4S,5R)-5-butyl-4-methyloxolan-2-one