Reaction catalyzed by rhamnulose-1-phosphate aldolase (4.1.2.19)

		+			=
	glycerone phosphate	+		ethyl-3-methyl-4-oxocrotonate	=		(3R,4S,5E)-7-ethoxy-3,4-dihydroxy-5-methyl-2,7-dioxohept-5-en-1-yl phosphate