Potent and selective TRPA1 channel activator (EC50 = 65 nM); activates the TRPA1 channel by covalently and site-selectively binding to Cys621. Exhibits selectivity for TRPA1 over TRPV1, TRPV3, TRPV4, TRPM2, TRPM8, and TRPC5 channels (EC50 values are >1 μM). Purity 98%. MW (observed): 354.85