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An in-depth overview of computer-aided chemical design is presented through a discussion of three systems that we developed: the Molecular Design Support System, MolWorld, and the Molecular Orbital Graphics System. The first is considered as an example of the kernel of a simulation system for industrial research and development. The chemical formula interpreter and three-dimensional molecular geometry generator of MolWorld are discussed as a compact realization of intelligence. Finally, the use of visualized molecular electronic structures in relation to chemical reactions is considered in the discussion of the Molecular Orbital Graphics System.
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