The resulting scaffold structures are characterized by their rigidity, stereochemical and functional group complexity, high density and {HEAD ~ diversity} of functionality radially arrayed from which to generate highly diversified libraries, and by the minimal need to employ protecting groups during the synthesis of {TAIL ~ the scaffold structures} and combinatorial libraries 
The resulting scaffold structures are characterized by their rigidity , stereochemical and functional group complexity , high density and { HEAD ~ diversity } of functionality radially arrayed from which to generate highly diversified libraries , and by the minimal need to employ protecting groups during the synthesis of { TAIL ~ the scaffold structures } and combinatorial libraries
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