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a) Oxidative cyclisation is a key step in the biosynthesis of spirobenzofuranes 189, 192 and 193. b) Mechanism of the proposed cytochrome P450-catalysed stereospecific radical coupling in the biosynthesis of griseofulvin (193). CP: chloroperoxidase; SO: sulochrin oxidase; DHO: dihydrogeodin oxidase [157–159].
