This indicates that these polysaccharides are not entirely natural but are instead partially synthesized or modified in the laboratory. Researchers might be starting with natural chondroitin sulfate and then introducing specific modifications.
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ethyl 2,4-di-O-benzyl-3-O-tert-butyldimethylsilyl-1-thio-β-L-fucopyranoside
(8E,12E,14E)-(1R,4S,6R,11R,18R,19R,22S)-4-((Z)-(R)-6-Cyclohexyl-2,6-dihydroxy-4-oxo-hex-2-enyl)-6,19,22-trihydroxy-9,11,20-trimethyl-3,17-dioxa-tricyclo[13.6.1.018,22]docosa-8,12,14,20-tetraen-2-one
