| Section2 = | Section3 =, | SPhrases =,, }} }} Pyrazine's a heterocyclic aromatic organic compound. Pyrazine's a symmetrical molecule with point group D2h. It's found in folic acid in the form of pterin. Derivatives like Phenazine are well known for their antitumor, antibiotic and diuretic activity. Pyrazine's less basic in nature than pyridine, pyridazine and pyrimidine. Tetramethylpyrazine (also known as ligustrazine)'s reported to scavenge superoxide anion and decrease nitric oxide producti… (More on Pyrazine)