Anpirtoline (chemical formula C10H13ClN2S) is a synthetic chemical compound used as a 5-HT1B receptor agonist as well as a 5-HT3 receptor antagonist, causing a decrease in serotonin synthesis and a reduction in aggressive behavior.

Anpirtoline hydrochloride appears as a white solid at room temperature and is soluble in water and DMSO.

Structurally, the most notable parts of anpirtoline hydrochloride are two six-membered rings bonded via a sulfur atom.

Studies involving social instigation, aggression, and other behavioral traits make ample use of the compound.

[4] Anpirtoline hydrochloride should be stored in a cool, well-ventilated area that is not exposed to direct sunlight.