GZD856 formic is a potent, orally active inhibitor of PDGFRα/β and Bcr-Abl T315I, demonstrating IC50 values of 68.6 nM and 136.6 nM for PDGFRα/β, respectively, and 19.9 nM and 15.4 nM for native Bcr-Abl and the T315I mutant, respectively. This compound exhibits significant antitumor activity.