5-hydroxyfuranocoumarin 5-O-methyltransferase activity
5-hydroxyfuranocoumarin 5-o-methyltransferase activity
Catalysis of the reaction: a 5-hydroxyfurocoumarin + S-adenosyl-L-methionine = a 5-methoxyfurocoumarin + S-adenosyl-L-homocysteine + H+.