Umbellulone is a natural product isolated from Umbellularia californica, and stimulates the TRPA1 channel in a subset of peptidergic, nociceptive neurons, activating the trigeminovascular system via this mechanism.
TRPA1 Antagonist 3 is a compound with photoswitchable properties that acts as an agonist on the TRPA1 channel, providing the ability for optical control.