4-Nitro-benzenesulfonic acid 2-(4-chloro-phenyl)-1-methyl-2-oxo-ethyl ester
4-Nitro-benzenesulfonic acid 2-(4-bromo-phenyl)-1-methyl-2-oxo-ethyl ester
2-<(4-Nitrobenzenesulfonyl)oxy>-1-phenylethanone
4-nitro-benzenesulfonic acid 2-oxo-2-p-tolyl-ethyl ester
4-Nitro-benzenesulfonic acid 1-oxo-indan-2-yl ester