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From The Collaborative International Dictionary of English v.0.48:
Quinoxaline \Quin*ox"a*line\, n. [Quinoline + glyoxal.] (Chem.) Any one of a series of complex nitrogenous bases obtained by the union of certain aniline derivatives with glyoxal or with certain ketones. [Written also chinoxaline.] [1913 Webster]