3,6-Di-O-(3,4,6-tri-O-acetyl--D-mannopyranosylethylidyne)-1,2-O-ethylidene--D-mannopyranose;O-3,4,6-Tri-O-acetyl--D-mannopyranosylethylidyne-(1-23)-O-[3,4,6-tri-O-acetyl--D-mannopyranosylethylidyne-(1-26)]-1,2-O-ethylidene--D-mannopyranose
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