The screening with tree - structured data is applied to the.Search for the query with generic terms like A X Q and,,,,M where A, corresponds to any X to halogens Q to,,,Heteroatoms and M, to metal atoms. The symbol XX is used.To notify a terminal node of a polymer unit so that the nodes.Are distinguished from those of monomeric structures. The.Tree-structured screening is more selective and faster than.The fragment-oriented screening even when they include the.Generic atoms of broader meaning.The present system uses no full description of connection.Tables. Since the resulting connectivity data among the atoms.Are flexible it is, also possible to contain generic (Markush).Structures. This feature is common to such tree-structured.Systems as the present one and the S4.One of the important database functions is modification.Of data with registration and updating. As long as the.Analysis data are stored in, conventional database manipulation.Is easy for fragment screening. On the other hand the.Tree-structured screening methods are appropriate for the data.That does not need frequent changes because the, tree files.And registry number file have to be reconstructed on each.Modification. This subject should be solved in the future.
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