The extended ASCII nomenclature as recommended by IUPAC is used to input the sequence
of complex oligosaccharides. However, some additional input rules have to be fulfilled.
In case only the topology and composition of the oligosaccharide is known, a simpler way
to input carbohydrate sequences is possible. Since the hydroxyl groups of synthetic
carbohydrates are often the are protected we have included a way to indicate if sugar
residue are persubstituted. Please have a look at the examples of valid input structures
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