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Chemical structures of the five sesquiterpenoid phytoalexins putatively identified in this study. All the sesquiterpenes, by definition, have the basic skeleton of C15 and are synthesised from a C15 molecule, farnesyl diphosphate (FPP), through the reactions catalysed by the enzymes prenyltransferase and sesquiterpene cyclases. The end products of these enzymes-catalysed reactions are various sesquiterpenoids with varying number of carbons such as C15, C14 and C17 [49,50,51,52].
