Suggested Reaction 1.14.16.-

Left

Hydroxysanguinarine
+6,7-Dihydrobiopterin
+H2O

Right

13,14-Dihydro-13-methyl-[1,3]benzodioxolo[5,6-c]-1,3-dioxolo[4,5- i]phenanthridine
+2-Amino-6-(1,2-dihydroxypropyl)-5,6,7,8-tetrahydoro-4(1H)- pteridinone
+O2

[BiSSCat | GREP ]