The molecule is a pyrroloquinoline having oxo groups at the 4- and 5-positions and carboxy groups at the 2-, 7- and 9-positions. It has a role as a water-soluble vitamin and a cofactor. It is a member of orthoquinones, a tricarboxylic acid and a pyrroloquinoline cofactor. It is a conjugate acid of a pyrroloquinoline quinone(3-).
4,5-dioxo-1H-pyrrolo[2,3-f]quinoline-2,7,9-tricarboxylic acid