A cell-permeable pyrazolidinedione compound that is shown to target RhoGEF DH-PH domain junction with high affinity (Kd = 65nM) and effetively prevent RhoGEFs LARG, p115, and PDZ from interacting with RhoA, while displaying little potency against DBL-RhoA, LBC-RhoA, intersectin-Cdc42, or TrioN-Cdc42 interact