1-{5-[(1S)-2-amino-1-hydroxy-2-oxo-1-phenylethyl]-7,8-dimethyl-2,4-dioxo-1,2,3,4-tetrahydrobenzo[g]pteridine-5,10-diium-10-yl}-1-deoxy-5-O-phosphono-D-ribitol

O52792 — 4-hydroxymandelate oxidase