Synonyms : 2, 7, 9-Tricarboxy-1H-Pyrrolo-(2, 3-f)Quinoline-4, 5-Dione, 2, 7, 9-Tricarboxypyrroloquinoline Quinone, 4, 5-Dihydro-4, 5-Dioxo-1-H-Pyrrolo(2, 3-f)Quinoline-2, 7, 9-Tricarboxylic Acid, Coenzyme PQQ, PQQ Coenzyme, Pyrrolo-Quinoline Quinone, Pyrroloquinoline Quinone