KV4.3 channel activator; mediates the transient outward K+ current (Ito). Increases IKv4.3 peak current amplitude in CHO-K1 cells expressing KV4.3 and KChIP2 (EC50 = 5.3 μM). Inhibits Kv1.4 mediated currents independently of KChIP2. Also slows the decay of KV4.2 and KV4.3 currents in the presence of KChIP2.