| http://www.w3.org/ns/prov#value | - A polymeric compound comprising 2 to 100 units of Dglucosamine, each unit bearing a compound of formula it : wherein R2 is a hydrogen or acetyl and R3 is phenyl or tButyloxy and wherein R is CO (CH2) nCOX in which n is 2 to 14 and X is a bond attaching the compound of formula 11 to a nitrogen of one of said Dglucosamine and Ri is a hydrogen.
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