Reaction catalyzed by vitamin-K-epoxide reductase (warfarin-insensitive) (1.17.4.5)

		+			=			+
	3-hydroxy-2-methyl-3-phytyl-2,3-dihydro-1,4-naphthoquinone	+		oxidized dithiothreitol	=		2,3-epoxy-2-methyl-3-phytyl-2,3-dihydro-1,4-naphthoquinone	+		1,4-dithiothreitol