Weakly and reversibly inhibits rat homomeric ASIC1 (isoform ASIC1a) (IC(50)=4.95 uM), and ASIC3 (IC(50)=17 uM) (PubMed:29684594, PubMed:32326130). ASIC1a current inhibition and ASIC3 transient current inhibition are not complete, and reach a maximum of 70% inhibition and 80%, respectively (PubMed:32326130). Belongs to the sea anemone type 3 (BDS) potassium channel toxin family.