Potent and selective TRPV4 antagonist. Reversibly inhibits currents through mouse, human and rat TRPV4 orthologs (IC50 values are 17, 48 and 133 nM). Also inhibits the endogenous TRPV4-mediated response to 4α-PDH (IC50 = 22 nM). Selective for TRPV4 over TRPV1, TRPV2, TRPV3 and TRPM8 channels.