Reaction catalyzed by flavone 3'-O-methyltransferase (2.1.1.42)

		+			=			+
	S-adenosyl-L-methionine	+		5,7,3',4'-tetrahydroxyflavone	=		S-adenosyl-L-homocysteine	+		5,7,4'-trihydroxy-3'-methoxyflavone