Structural investigation of the antibiotic ristomycin A. Synthesis of ristobiose and ristotriose.

Abstract
Proof is given by synthesis confirming the structure of ristobiose as 2-O-.alpha.-D-mannopyranosyl-D-glucose (IV) and ristotriose as O-.alpha.-L-rhamnopyranosyl (1 .fwdarw. 6)-O-[.alpha.-D-mannopyranosyl (1 .fwdarw. 2)]-D-glucose (X) which are obtained from ristomycin A upon mild acid hydrolysis. Both oligosaccharides, IV and X, were detected for the 1st time as the components of an antibiotic.

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