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Document<br />

Figure 6<br />

The combination of structure-<strong>based</strong> design and combinatorial<br />

chemistry can facilitate the generation of recombined<br />

compounds to rapidly produce potent compounds with<br />

maximum chemical and structural diversity.<br />

to provide information regarding how substituents are interacting with the target and when binding<br />

modes change. This information may be essential if SAR models are to remain predictive over large<br />

numbers of compounds.<br />

Page 534<br />

The integrated drug discovery process utilizes as much information as is available to find and optimize<br />

initial lead compounds. Because the automated synthesis of large libraries of compounds requires<br />

reliable and versatile chemical reactions, initial libraries are designed to discover new chemical lead<br />

classes or to develop SAR models. Both library and substituent designs evolve as hits are encountered<br />

and the structures of target—inhibitor complexes are determined. Single modifications on both the<br />

template and substituents may be made during the process <strong>based</strong> on the structures of target—lead<br />

complexes. When sufficient SAR data has accumulated and the structures of target complexes with key<br />

templates and substituents have been determined, potent compounds with the desired “drug like”<br />

compositions are designed and synthesized using a structure-<strong>based</strong> recombination strategy (Figure 6).<br />

The integration of these recent advances in drug discovery offers the possibility to substantially decrease<br />

the time required to find initial leads and develop them into prototype drugs. Similarly, the interval<br />

required to produce preclinical development compounds and backup candidates is also expected to<br />

shrink. Perhaps most interesting is the potential of this integrated technology, which is ultimately <strong>based</strong><br />

on an abstract information model of the biological process, to dramatically increase the reliability of<br />

successful drug development<br />

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