Suggested Reaction 1.14.16.-

Left

S-Alkyl-L-cysteine S-oxide
+6,7-Dihydrobiopterin
+H2O

Right

RS-CH2-CH(NH3+)COO-
+2-Amino-6-(1,2-dihydroxypropyl)-5,6,7,8-tetrahydoro-4(1H)- pteridinone
+O2

[BiSSCat | GREP ]