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==SMILES definition as strings of a context-free language==
From the view point of a formal language theory, SMILES is a word. A SMILES is parsable with a context-free parser. The use of this representation has been in the prediction of biochemical properties (incl. toxicity and biodegradability) based on the main principle of chemoinformatics that similar molecules have similar properties. The predictive models implemented a syntactic pattern recognition approach (which involved defining a molecular distance) as well as a more robust scheme based on statistical pattern recognition. <ref name="Weininger-1988">{{cite journal| last1=Weininger| first1=David| title=SMILES, a chemical language and information system. 1. Introduction to methodology and encoding rules| journal=Journal of Chemical Information and Computer Sciences| volume=28| issue= 1|pages=31–6|date=February 1988|doi=10.1021/ci00057a005 }}
== Description ==
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