AC710 Mesylate is a potent, selective PDGFR-family kinases inhibitor with Kd values of 0.6 nM/1.0 nM/1.3 nM/1.0 nM for FLT3/KIT/PDGFRα/PDGFRβ respectively.

AC710 demonstrated equivalent or slightly better efficacy in reducing the joint swelling and inflammation than dexomethasone administered at a safe dose. AC710 was well tolerated at the tested doses based on body weight and body condition. On the basis of the overall better in vivo tolerability and the mouse efficacy data,

compound 22b (AC710) was selected as a preclinical development candidate.