Fasnall benzenesulfonate is the benzenesulfonate salt form of Fasnall. Fasnall benzenesulfonate is the inhibitor for fatty acid synthase (FASN) with IC 50 of 3.7 μM. Fasnall benzenesulfonate inhibits the proliferation and induces apoptosis in breast cancer cells. Fasnall benzenesulfonate exhibits antitumor efficacy in mice.