What is meant by a 'src_id' and a 'src_compound_id' in UniChem ?

src_id

src_ids are integers that are unique identifiers for sources in UniChem. A list of valid src_id's can be found either on the sources page or by using the web services.

src_compound_id

src_compound_ids are the individual compound identifiers provided by each of the sources. For example 'CHEMBL12' is a src_compound_id from the 'chembl' source (src_id = 1). Since src_compound_ids may be ambiguous across different sources, querying UniChem with a src_compound_id also requires the specification of a corresponding src_id. src_compound_ids are dealt with in a case sensitive manner, as explained here.