The MDL Beilstein Crossfire database combines the Beilstein Handbook of Organic Chemistry and the Gmelin Handbook of Inorganic Chemistry into the largest property database online with a sophisticated search and retrieval interface. The Beilstein section covers the organic literature on over 9 million organic compounds, 9 million reactions and 40 million property values from 1771 to the present. The Gmelin section contains 1.6 million inorganic and organometallic compounds, 1.3 million structures, 1.3 million reactions, and over 800 chemical and physical data fields, including electric, magnetic, thermal, crystal, and physiological data.