Suggested Reaction 1.14.16.-

Left

17beta,19-Dihydroxyandrost-4-en-3-one
+6,7-Dihydrobiopterin
+H2O

Right

17beta-Hydroxy-4-androsten-3-one
+2-Amino-6-(1,2-dihydroxypropyl)-5,6,7,8-tetrahydoro-4(1H)- pteridinone
+O2

[BiSSCat | GREP ]