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Ochratoxins structure. The red color represents the phenylalanine moiety deriving from the shikimic acid pathway. The green color represents the isocoumarin nucleus. OTA: ochratoxin A; MeOTA: ochratoxin A methyl ester; OTC: ochratoxin C; OTB: ochratoxin B; MeOTB: ochratoxin B methyl ester; EtOTB: ochratoxin B ethyl ester, OTα, and OTβ.
