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Enzymatic phosphorylation of 3 analogues. A) The reaction catalysed by CapP and Cpr17 (encoded in the 3 and A-102395 biosynthetic gene clusters, respectively). B) HPLC traces for representative 3 analogues following the reaction with Cpr17. The inset shows the mass spectrum in negative ionisation mode for the monophosphorylated product.
