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HPLC chromatograms of samples taken after 1 and 4 days of incubation of F. sambucinum with HBOA (initial concentration, 1 mM) monitored at 280 nm. HBOA is transformed to N-(2-hydroxyphenyl)malonamic acid (compound 6) (final concentration, 0.31 ± 0.03 mM, determined with an external standard). Values on the y axis are in milli-absorption units.
