EC50: 230 nM (Kv7.2 channel), 510 nM (Kv7.4 channel)

ML213 (100 nM-30 μM) increases maximal conductance to a peak at 212% ± 27% of control, with an EC ₅₀ of 0.8 ± 0.3 μM. ML213 (10 μM) reduces the deactivation rates of Kv7.4 currents by 4.6-fold in the voltage range from ?130 mV to ?90 mV. ML213 is a potent and effective activator of homomeric Kv7.5 channels overexpressed in A7r5 cells. ML213 increases maximal conductance of Kv7.5 channels with an EC ₅₀ of 0.7 ± 0.2 μM. ML213 (10 μM) also reduces deactivation rates of Kv7.5 currents by 5.9-fold on average. ML213 produces similar effects on heteromeric Kv7.4/7.5 channels: 204% ± 11% maximal increase in conductance with an EC ₅₀ of 1.1 ± 0.6 μM and a 34.2 ± 3.3 mV maximal negative shift of the activation curve, with an EC ₅₀ of 3.8 ± 1.2 μM. ML213 causes a vasorelaxation in different precontracted rat blood vessels. ML213 (10 μM) also hyperpolarizes mesenteric artery smooth muscle cells. ML213 causes a concentration-dependent shift in the V1/2 for KCNQ2 activation with an EC ₅₀ 340 ± 70 nM and a maximal shift of 37.4 mV.