The molecule is a butan-4-olide having a 2-[(4-methoxyphenylsulfonyl)oxy]ethyl group at the 3-position and two methyl substituents at the 5-position. It is a butan-4-olide and an arenesulfonate ester.
2-(5,5-dimethyl-2-oxooxolan-3-yl)ethyl 4-methoxybenzenesulfonate