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S. griseovariabilis . The biosynthesis of QXC is a part of that of echinomycin. L-Trp: L-tryptophan; L-Trp-S-Qui18: L-tryptophanyl-S-Qui18; (2S,3S) hTrp-S-Qui18: (2S,3S) β-hydroxytryptophanyl-S-Qui18; (2S,3S) hTrp: (2S,3S) β-hydroxytryptophan; (2S,3R) hNFK: (2S,3R) N-formyl-β-hydroxykynurenine; QXC: quinoxaline-2-carboxylic acid.
