Abstract: The six step from 3-hydroxyanthranilic acid to the epoxyquinol LL-C10037a, 1, produced by Streptomyces LL-C10037 have been determined by whole-cell feedings with deuterated substrates and by cell-free studies. 3-Hydroxyanthranilic acid, 2, is decarboxylated to 2-hydroxyaniline, 11, and then oxidized to 2, 5-dihydroxyaniline, 8. Acetylation at nitrogen and oxidation afford acetamido-1, 4-benzoquinone, 4. A crude cell- ...