sentence: Aromatic compounds play key roles in the biochemistry of all living things.
sentences_after: The four aromatic amino acids histidine, phenylalanine, tryptophan, and tyrosine each serve as one of the 20 basic building blocks of proteins. Chlorophyll also has a similar aromatic system.
concept_name: aromatic compound
headings: Aromatic hydrocarbon Importance of aromatic compounds
categories: Organic compounds