Structure of (<i>R</i>,<i>R</i>)-4-bromo-2-{4-[4-bromo-1-(4-toluenesulfonyl)-1<i>H</i>-pyrrol-2-yl]-1,3-dinitrobutan-2-yl}-1-(4-toluenesulfonyl)-1<i>H</i>-pyrrole, another ostensible by-product in the synthesis of <i>geminal</i>-dimethyl hydrodipyrrins
Acta crystallographica. Section E, Crystallographic communications