Reaction catalyzed by 3-Hydroxy-3-isohexenylglutaryl-CoA lyase (4.1.3.26)

		=			+
	3-hydroxy-3-(4-methylpent-3-en-1-yl)glutaryl-CoA	=		7-methyl-3-oxooct-6-enoyl-CoA	+		acetate