| http://www.w3.org/ns/prov#value | - A compound of Formula I : or a salt thereof, wherein R2 is a hydrogen or acetyl and R3 is phenyl or t Butyloxy and wherein R and Ri, identical or different, are independently a hydrogen or CO (CH2) nCOX in which n is 2 to 14 and X is an amino sugar or a polymer thereof, a monosaccharide, a disaccharide, a polysaccharide or an amino acid.
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