for the following products
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 and 3,6-Di-O-(3,4,6-tri-O-acetyl-beta-D-mannopyranosylethylidyne)-1,2-O-ethylidene-beta-D-mannopyranose
