Web version of reaxys (formerly mdl crossfire)
Reaxys is a web-based search and retrieval system for chemical compounds, bibliographic data and chemical reactions. Combined data from three sources: the Beilstein Database, the Gmelin Database, and the Patent Chemistry Database.
1-888-615-4500 Help Desk Assistance for Reaxys
Link to more information about Reaxys including tutorials and webinars here