Search for compounds

Enter one of the identification values (CAS number, FEMA number, molecular weight, etc) to get one compound or a list of compounds that corresponds to the selection criterion.

Enter a name string for a compound name search. The 'exact search' method looks for the exact representation of the name string anywhere in the compound name or in the synonyms. Often the position of specific elements within the name are uncertain or unknown. You may choose for the 'approximate search' method, which filters the input string and, in general, provides more results. Be aware: fuzzy searches give fuzzy answers.

Search within results

After the name search for a compound you will get a list of names which correspond to the string. The search is done in all synonym names, but only the list of compound names is shown. Sometimes this list is quite long, so the possiblity is added to enter an additional search string. This argument searches within the displayed results, again both in the compound names as well as in the synonyms thereof. This process can be repeated endlessly.

It is also possible to enter an exclude string: the result is a list of compound names where this exclusion string does not appear in the name. Not in the compound name, and also not in any of the synonyms belonging to that compound.

An example of usage is the search for names with 'ethyl'. Enter the 'ethyl' string first, then enter 'methyl' as the exclude string to remove any *methyl* names.

The search within results option is also available for the search in literature references.

Additional search possiblities

When searching for 'alpha', 'beta', etc within names you may use the replacing strings 'alpha-', 'beta-', 'gamma-', 'delta-', 'epsilon-' or 'psi-'. Allways include the minus sign in your search string. It is also possible to use the HTLM coded values α, β, γ, δ, ε, ψ, allways followed by a minus sign. These characters have no influence when using the 'approximate search' method: they are filtered out.