Crystal structures of 4-{(<i>E</i>)-3-[(imino-λ<sup>5</sup>-azanylidene)amino]prop-1-enyl}-<i>N</i>,<i>N</i>-dimethylimidazole-1-sulfonamide and 2-[(imino-λ<sup>5</sup>-azanylidene)amino]-4-{(<i>E</i>)-3-[(imino-λ<sup>5</sup>-azanylidene)amino]prop-1-enyl}-<i>N</i>,<i>N</i>-dimethylimidazole-1-sulfonamide
Acta crystallographica. Section E, Crystallographic communications