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Quantitative structure-activity relationship (QSAR)
(sometimes QSPR: quantitative structure-property relationship)
QSAR is the process by which chemical structure is quantitatively correlated with a well defined process, such as biological activity or chemical reactivity.
For example, biological activity can be expressed quantitatively as in the concentration of a substance required to give a certain biological response. Additionally, when physicochemical properties or structures are expressed by numbers, one can form a mathematical relationship, or quantitative structure-activity relationship, between the two. The mathematical expression can then be used to predict the biological response of other chemical structures.
http://en.wikipedia.org/wiki/Quantitative_structure-activity_relationship
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