Hepta-O-acetyl-O-α-D-Rhap-(1 → 3)-O-α-D-Rhap-(1 → 2)-glycerol (5) was the major component derived by way of Smith degradation of A-band polysaccharide (a D-rhamnan isolated from a mutant, AK1401, of Pseudomonas aeruginosa strain PAO1). The structure has been verified by an unambiguous synthesis of 5. Based on mass spectrometric evidence, hepta-O-acetyl-O-Ribp-(1 → 3)-O-α-D-Rhap-(1 → 2)-glycerol is considered to be one of the minor components. The Smith degradation of A-band polysaccharide and the synthesis of 5 are reported.

• Compound ID: 829
  

  -3)-a-D-Rhap-(1-3)-a-D-Rhap-(1-2)-a-D-Rhap-(1-

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  Structure type: polymer chemical repeating unit
  Trivial name: common antigen, common polysaccharide antigen, A band polysaccharide, D-rhamnan, repeat unit of the lipopolysaccharide side-chain, A-band polysaccharide (A-PS), A-band polysaccharide
  Compound class: O-polysaccharide, O-antigen, LPS, enterobacterial common antigen, CPA
  Reference(s) to other database(s): GTC:G80135ZC, GlycomeDB:25893
  
   
  
  Pseudomonas aeruginosa PAO1, Pseudomonas aeruginosa AK1401
  CSDB ID 112360 (all data & tools)