Occurrence and Structural Features of the Natural Sugars

Occurrence of Derivatives of 5,7-Diamino-3,5,7,9-tetradeoxynon-2-ulosonic Acids (1-4) in Bacterial Polysaccharides 

In 1987, a second isomer of this class was found in OPS of P. aeruginosa 012 and thought to have the v -glycero-L-galacto configuration.30 The same, or mistakenly inferred as the same, sugar was reported to be present in a 

A fourth sugar was found only in LPS of L. pneumophila.12,40 It was initially identified as the L-glycero-o-talo isomer12 but later revised to the D-glycero-D-talo isomer and named 4-epilegionaminic acid (4).11,40 Two more stereoisomers of the nonulosonic acids were found in several other L. pneumophila isolates40 but their configurations have not yet been determined. 

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