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(A) Biosynthetic pathway of 1 and 2, showing nonenzymatic degradation pathway of 2 to 9 by hydrolysis and spontaneous decarboxylation at C11a to form 10 (gray arrows). (B) Heatmap of LC-MS/MS response for biosynthetic intermediates of 2 accumulated in single-gene KO strains of Penicillium sp.
