CDP-paratose synthase (EC 1.1.1.342, rfbS (gene)) is an enzyme with systematic name CDP-alpha-D-paratose:NADP+ 4-oxidoreductase. This enzyme catalyses the following chemical reactionCDP-alpha-D-paratose + NADP+ CDP-4-dehydro-3,6-dideoxy-alpha-D-glucose + NADPH + H+