Information TD-139 TD-139 (GB0-139) is a potent and selective inhibitor of galectin-3 with Kd of 0.036 µM over galectin-1 and galectin-7 with Kd of 2.2 µM and 32 µM, respectively. TD-139 is used potentially for the treatment of idiopathic pulmonary fibrosis (IPF). Targets galectin-3 (Cell-free assay); galectin-1 (Cell-free assay); galectin-7 (Cell-free assay) 0.036 μM(Kd); 2.2 μM(Kd); 32 μM(Kd)