The Arabidopsis flavonoid subnetwork. In Figure 1 the compounds are drawn as rectangular and oval shapes. Black refers to internal metabolites, blue to external substrates and green to external products; dotted lines specify the metabolite taking part in other reactions outside the subnetwork. 'CPD' is an abbreviation for 'COMPOUND'. This is one form of the names (synonyms) given to compounds in the AraCyc database. For example, the name for 'liquiritigenin' in the AraCyc database and used in the data files available for downloading is CPD-3041.