Reaction catalyzed by 2-amino-4-hydroxy-6-hydroxymethyldihydropteridine diphosphokinase (2.7.6.3)

	ATP	+			=		AMP	+
	ATP	+		6-hydroxymethyl-7,8-dihydropterin	=		AMP	+		6-hydroxymethyl-7,8-dihydropterin diphosphate