•There are lots of identifiers associated with a particular substance.
–CAS Number
–NCI Number
–IUPAC Name
–Common name
•These may or may not have data associated with them.
•However it is imperative to ensure that data is associated with the appropriate identifier. E.g.
–Biological test data is associated with the sample identifier, not with the structure. In this case the structure is a datum about the
sample id.