SYNTHESIS OF THE PRINCIPAL CHAIN OF THE o-ANTIGENIC POLYSACCARIDES OF Shigella Flexneri. COMMUNICATION 3. SYNTHESIS OF 4-O-BENZOYL-3-O-(2-O-ACETYL-3,4-DI-O-BENZOYL-α-L-RHAMNOPYRANOSYL)-1,2-O--β-L-RHAMNOPYRANOSE

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