TC LPA5 4 is a selective, non-lipid antagonist of the lysophosphatidic acid receptor LPA5 used in research to probe LPA5-mediated signaling. It exhibits antagonist activity at human LPA5 (cellular IC50 ~0.8 μM), inhibits LPA-induced platelet aggregation, reduces proliferation and migration of thyroid cancer cells in vitro, and has shown efficacy in mouse xenograft studies.