Anionic polysaccharide derivatives partially functionalized by at least two vicinal hydrophobic groups, the hydrophobic groups, which are identical or different, being carried by an at least trivalent radical or spacer, a method of synthesis of the functionalized polysaccharides, and pharmaceutical compositions having one of the polysaccharides and at least one active principle are provided. Various embodiments are disclosed, including embodiments having improved sensitivity and shielding from stray fields and for shielding from magnetic fields generated by the coil excitation. A flange portion is formed on each of the return pipe halves, while a pair of fixing leg portions covering the flange portion of each return pipe half is formed on the pipe hold down member. The decoded date information can be used in a determination relating to the object. Post-processors are no longer required to be dedicated to a particular purpose such as billing computation.