Crystal structures of 4-bromo-2-formyl-1-tosyl-1<i>H</i>-pyrrole, (<i>E</i>)-4-bromo-2-(2-nitrovinyl)-1-tosyl-1<i>H</i>-pyrrole and 6-(4-bromo-1-tosylpyrrol-2-yl)-4,4-dimethyl-5-nitrohexan-2-one
Acta crystallographica. Section E, Crystallographic communications