Potent and selective 5-HT1D receptor agonist that displays > 600-fold selectivity over 5-HT1A and 5-HT2A receptors and no activity at 5-HT1B, 5-HT1E, 5-HT2B, 5-HT2C, 5-HT6 and 5-HT7 receptors. Reduces dural plasma extravasation evoked by trigeminal ganglion stimulation.