Combinatorial chemistry has allowed the productivity of synthetic organic chemists to be multiplied by orders of magnitude. Nevertheless, it will not only be a pure numbers game to find new chemical entities; combinatorial libraries will also have to be designed carefully. Otherwise, combinatorial chemistry tends to produce compounds whose physicochemical parameters such as lipophilicity and molecular weight reach undesired values. Furthermore, the diversity of synthesized compounds must respond to the problems that have to be solved since diversities that are either too large or too small within libraries will reduce the efficiency of the synthetic process. Although diversity space is incredibly large, it is worth considering that certain structural features are occurring in diverse drug motifs and these deserve special attention when synthesizing drug-like libraries for general screening purposes.

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