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Manumycin-type polyketides. (a) General structure. Lower polyketide chains are colored in blue, upper chains in green. (b) Examples of variability in both polyketide chains. The lower chain contains 3,4-AHBA as a starter unit prolonged with linear, usually polyene, 4- to 8-carbon chains, but may be saturated in rare cases (U-62,162). The upper chain shows the highest variability affecting length, saturation, branching pattern, and starter unit selection.
