The Enzyme Function Initiative (EFI) compounds are collabocules and as such are not for sale to the general public. They are available to collaborators on the EFI research project and may be available to others depending on the circumstances. If any of these compounds interest you, and they are NOT available from any commercial source, please write to the correspondant for the appropriate catalog (see below) explaining your interest.
 These databases have been provided to us under collaborative agreements with each respective catalog owner. Catalogs have been filtered for drug discovery relevance, and thus compounds in the original catalog may not be in ZINC. Some documentation on ZINC subsets is available.
ZINC may be used free of charge for research by individuals and institutions. Whereas you are free to share the results of a ZINC search or a screen of molecules from ZINC, you may not redistribute major portions of ZINC without the express written permission of John Irwin.