A new molecule-based magnet, alpha-(benzo[1,2-d.4,5-d']bis[1,3,2]dithiazole (BBDTA))(2)ReBr6, comprised a one-dimensional network composed of an alternative alignment of BBDTA(+) (S = 1/2) and ReBr62- (S = 3/2) and an S = 1/2 regular chain network of the other BBDTA This material became a ferromagnet below 12 2 K The magnetization curve showed complex field dependence, which might be related to the orientation of the one-dimensional alternative network in its crystal