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The Derwent Innovations Index, available through the ISI Web of Science interface, is a database that merges the Derwent World Patents Index with the Derwent Patents Citation Index and contains the Derwent Chemistry Resource. It covers more than 20 million patent documents from over 40 patent-issuing authorities. With coverage dating back to 1963, this resource gives users a comprehensive and international overview of inventions in three categories: chemical, electronic and electrical engineering, and mechanical engineering. The chemistry resource allows searching and browsing of chemical structures.