quinoxaline
noun
qui·nox·a·line
kwi-ˈnäk-sə-ˌlēn
-ˌlīn
: a weakly basic bicyclic compound C8H6N2 made by condensing the ortho form of phenylenediamine with glyoxal and having fused benzene and pyrazine rings
also
: any of various derivatives of quinoxaline having antibiotic properties
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Merriam-Webster unabridged
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