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General structures of (A) serratiochelin A, (B) prodigiosin, (C) serratamolide and (D) glucosamine derivative (adapted from Dwivedi et al., 2008; Lee et al., 2011; Seyedsayamdost et al., 2012). The R1 and R2 groups on the serratamolides and glucosamine derivative structures indicate the fatty acyl moieties and these chains may vary in length and saturation (saturated, mono-unsaturated or poly-unsaturated).
