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Building blocks used for the synthesis of a CS/DS tetrasaccharide.[27] The chemical groups are the following: OTCA, reducing-end anomeric O1-trichloroacetyl; Bn, benzyl; Me, methyl; Lev, Levulinoyl esters; Bz, benzyl; NHTFA, N-triflouracetyl; OMP, reducing-end anomeric O1-methoxyphenyl ether; Si(tBu)2, di-t-butylsilyl.
