tert-butyl 2-[(4-ethenylphenyl)methylsulfonyloxymethyl]-2-methyl-3-oxo-3-phenylpropanoate;cyclohexyl (4-ethenylphenyl)methanesulfonate;(5,5-dimethyl-3-oxocyclohexen-1-yl) (2-methylprop-2-enoylamino)methanesulfonate;(2-methyl-6-oxopyran-4-yl) (2-methylprop-2-enoylamino)methanesulfonate;(3-oxoinden-1-yl) (2-methylprop-2-enoylamino)methanesulfonate;2-phenylethyl (4-ethenylphenyl)methanesulfonate;(2,2,5-trimethyl-4,6-dioxo-1,3-dioxan-5-yl)methyl (4-ethenylphenyl)methanesulfonate