Abstract
Chemical reactions [1] are described by chemists in a variety of ways, with graphical descriptions using structural formulae dominating. Figure 1 shows the information elements commonly used in such descriptions (graphics enclosed in boxes): the main elements are chemical structures with their roles. Reaction information sources should permit queries for any of the elements given in fig. 1. singly or in combination, because questions addressed to them show a great variety which cannot really be accomodated by anything less
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