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(PSU only, non-commercial purposes, requires registration) includes chemical patents from all major patent offices with enhanced searching features such as chemical structure (including Markush) and reactions
SciFinder-n indexes the chemical literature as well as providing searchable information regarding specific chemical substances, reactions, structure and substructure searching, chemical supplier information, and a retrosynthesis planner.
searchable by chemical structures, reactions, specific properties, and literature references (including patents)
Reaxys provides properties and reactions data for organic, inorganic, and organometallic chemicals. The database is searchable by chemical structures, reactions, specific properties, and literature references. Data are obtained from journal articles and chemical patents.