The crystal structures of three 3-methyl-1<i>H</i>-1,2,4-triazole-5-thiones, including a second polymorph of 4-[(<i>E</i>)-(5-bromo-2-hydroxybenzylidene)amino]-3-methyl-1<i>H</i>-1,2,4-triazole-5(4<i>H</i>)-thione and a redetermination of 4-amino-3-methyl-1<i>H</i>-1,2,4-triazole-5(4<i>H</i>)-thione
Acta crystallographica. Section E, Crystallographic communications