ethanol
2,3-dibromo-1,4-dimethoxy-but-2-ene
succinic acid
tetrabromo-cyclopent-4-ene-1,3-dione
sodium methylate
3,4-dibromo-1-(4-chloro-2-methylphenyl)-1H-pyrrole-2,5-dione
3,4-dibromo-1-(4-phenoxyphenyl)-1H-pyrrole-2,5-dione
3,4-dibromo-1-(3-chlorobenzyl)-1H-pyrrole-2,5-dione
4-(3,4-dibromo-2,5-dioxo-2,5-dihydro-1H-pyrrol-1-yl)benzonitrile
N-[4-(3,4-dibromo-2,5-dioxo-2,5-dihydropyrrol-1-yl)phenyl]acetamide