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a. RD domain in the biosynthesis of equisetin and fusaridione A. The activity of the RD domain results in release of the intermediate as the tetramate, trichosetin. Then, N-methylation is carried out to give equisetin. b. For the case of fusaridione A, the unstable pyrrolidinedione ring is opened through a reverse-Dieckmann reaction. c. Proposed biosynthetic pathway for burnettramic acids A and B.
