ID 1.1.1.254 DE (S)-carnitine 3-dehydrogenase. AN D-carnitine dehydrogenase. CA (S)-carnitine + NAD(+) = 3-dehydrocarnitine + H(+) + NADH. CC -!- Specific for the (S)-enantiomer of carnitine, i.e., the enantiomer of CC the substrate of EC 1.1.1.108. //