Suggested Reaction 1.1.3.-

Left

2-Amino-6-(1,2-dihydroxypropyl)-5,6,7,8-tetrahydoro-4(1H)- pteridinone
+O2

Right

6-Lactoyl-5,6,7,8-tetrahydropterin
+H2O2

[BiSSCat | GREP ]