A member of the class of pyrazines that is pyrazine in which all four hydrogens have been replaced by methyl groups. An alkaloid extracted from Chuanxiong (<em>Ligusticum wallichii</em>). ChEBI: Tetramethylpyrazine is a member of the class of pyrazines that is pyrazine in which all four hydrogens have been replaced by methyl groups. An alkaloid extracted from Chuanxiong (Ligusticum wallichii). It has a role as an antineoplastic agent, a vasodilator agent, a platelet aggregation inhibitor, a neuroprotective agent, an apoptosis inhibitor and a bacterial metabolite. It is an alkaloid and a member of pyrazines.