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Metabolic profiling of Streptomyces sp. IB2014/016‐6 led to the identification of three new tetrahydroisoquinoline natural products, perquinolines A–C (1–3). Labelled precursor feeding studies and the cloning of the pqr biosynthetic gene cluster revealed that 1–3 are assembled by the action of several unusual enzymes. The biosynthesis starts with the condensation of succinyl‐CoA and l‐phenylalanine...
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