2-Nitro-5-chlorbenzol-sulfonylchlorid; 3-METHOXY-2-NITRO-4-HYDROXY-5-BROMO-BENZALDEHYDE; 5-Chlor-2-nitro-benzolsulfonylchlorid; 5-bromo-4-hydroxy-3-(methyloxy)-2-nitrobenzaldehyde; 2-nitro-5-bromovanillin; 5-Brom-4-hydroxy-3-methoxy-2-nitro-benzaldehyd; 5-bromo-2-nitrovanillin; 5-bromo-4-hydroxy-3-methoxy-2-nitro-benzaldehyde;