8-hydroxyfuranocoumarin 8-O-methyltransferase activity
8-hydroxyfuranocoumarin 8-o-methyltransferase activity
Catalysis of the reaction: S-adenosyl-L-methionine + xanthotoxol = S-adenosyl-L-homocysteine + xanthotoxin. Xanthotoxol is also known as 8-hydroxyfuranocoumarin and xanthotoxin as 8-methoxyfuranocoumarin.