The molecule is a butan-4-olide having a (4-nitrophenylsulfonyloxy)methyl group at the 3-position and two methyl substituents at the 5-position. It is a butan-4-olide, an arenesulfonate ester and a C-nitro compound.
(5,5-dimethyl-2-oxooxolan-3-yl)methyl 4-nitrobenzenesulfonate