Reaction catalyzed by [histone H3]-lysine9 N-dimethyltransferase (2.1.1.368)

2		+			=	2		+
	2 S-adenosyl-L-methionine	+		a [histone H3]-L-lysine9	=		2 S-adenosyl-L-homocysteine	+		a [histone H3]-N6,N6-dimethyl-L-lysine9