Chemical Structure Lookup Service (CSLS)
Chemical Structure Lookup Service : CSLS
http://cactus.nci.nih.gov/lookup
Chemical Structure Lookup Service is meant to work as an addressbook for chemical structures …. Look up whether a structure occurs in any of tens of different databases, both public and commercial. Currently loaded pointers to: 30,983,310 entries from 80 databases, representing 26,416,001 unique chemical structures. This has been added to the tools section of Research Resources Subject Tracer™ Information Blog.