Iminoglycine

5-Amino-6-(1-D-ribitylamino)uracil + L-Tyrosine + S-Adenosyl-L-methionine ⇄ 5-Amino-5-(4-hydroxybenzyl)-6-(D-ribitylimino)-5,6-dihydrouracil + Iminoglycine + L-Methionine + 5'-Deoxyadenosine (2.5.1.147)
S-Adenosyl-L-methionine: amet_c, 5-Amino-6-(1-D-ribitylamino)uracil: 4r5au_c, L-Tyrosine: tyr__L_c