4-Dechloro-2-chloro-Regorafenib-d3 is the labeled analogue of 4-Dechloro-2-chloro-Regorafenib (D226495), an analogue of Regorafenib (R143000), which inhibits PDGFR tyrosine kinase with IC50=83nM. It is useful for the treatment of inflammation and as an anti-proliferative agent.