👉 Pyrazine is a chemical compound. It consists of 1-(4-methoxyphenyl)-3,5-diphenyl- and 675198-89-7 perchlorate ions. The formula for pyrazine is: PYZNHCH2CHCHClCH2N3. 1613. Pyrazinium, 1-(4-methoxyphenyl)-3,5-diphenyl-, perchlorate; 675198-89-7