FAZ-3780 (compound G3Ib) is an inhibitor of binding to the NTF2L domain of G3BP1/2 that binds to G3BP1 with a Kd of 0.15 μM. FAZ-3780 targets the protein-protein interaction domain of G3BP1/2 and specifically inhibits co-condensation of G3BP1, caprin 1, and RNA in vitro.