Suggested Reaction 1.14.16.-

Left

(E)-4-Hydroxy-3-methylbut-2-enyl diphosphate
+6,7-Dihydrobiopterin
+H2O

Right

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

[BiSSCat | GREP ]