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a) Nonactin (70) is formed from heterodimers of (−)(+)-dimeric nonactic acid and (+)(−)-dimeric nonactic acid. b) The product of the nonS gene catalyses the cyclisation of (6R,8R,E)-6,8-dihydroxy-2-methylnon-2-enoic acid thioester (71a and 71 b) to (+)-nonactic acid thioester (69b/72) [53,56,58].
