1.1.1.254 5.5 6.5 3-dehydrocarnitine + NADH 1.1.1.254 5.5 6.5 D-carnitine dehydrogenase, reduction of D-carnitine 1.1.1.254 6.5 7 D-carnitine dehydrogenase, reduction of 3-dehydrocarnitine 1.1.1.254 9 - - 1.1.1.254 9 9.5 (S)-carnitine + NAD+ 1.1.1.254 9 9.5 D-carnitine dehydrogenase, oxidation of D-carnitine 1.1.1.254 9.3 - D-carnitine dehydrogenase, oxidation of D-carnitine