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Representative metabolites from type II fatty acid synthase (FAS) and polyketide synthase (PKS) pathways. Fatty acids: palmitic acid (1) and palmitoleic acid (2). Polyene (type II) polyketide: ishigamide (3). Aromatic polyketides: agricultural antibiotic frenolicin B (4), antibiotic oxytetracycline (5), and anticancer doxorubicin (6).
