Synonyms: Pyrazine,tetra-2-pyridinyl- (9CI); Pyrazine, tetra-2-pyridyl- (6CI,7CI,8CI);2,3,5,6-Tetra(2-pyridyl)pyrazine; 2,3,5,6-Tetra(2'-pyridyl)pyrazine;2,3,5,6-Tetra-2-pyridinylpyrazine; 2,3,5,6-Tetrakis(2-pyridinyl)pyrazine;2,3,5,6-Tetrakis(2-pyridyl)pyrazine; 2,3,5,6-Tetrakis(2'-pyridyl)pyrazine;2,3,5,6-Tetrakis(a-pyridyl)pyrazine;Tetra(2-pyridyl)pyrazine; Tetra-2-pyridinylpyrazine; Tetra-2'-pyridylpyrazine