The chemical reactions and pathways resulting in the breakdown of compounds derived from amino acids, organic acids containing one or more amino substituents. [ GOC:ai ]
Synonyms: cellular modified amino acid breakdown cellular modified amino acid degradation cellular modified amino acid catabolic process cellular amino acid derivative catabolic process cellular amino acid derivative breakdown cellular modified amino acid catabolism cellular amino acid derivative catabolism amino acid derivative catabolic process modified amino acid catabolism cellular amino acid derivative degradation