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Structural representation of (A and B) dialdehydes 1 and 2 (compounds 12a and 17 of reference[24o]) utilized respectively for synthesis of (C) D-GlcA and (D) L-IdoA building blocks (compounds 16 and 22 of reference[24o]). The abbreviation of protecting groups are: Bn, benzyl; Lev, levulinoyl ether; Me, methyl, Piv, pivaloyl; Set, silyl ether.
