preferred_name: a N-[omega-(9R,10R)-epoxy-(13R)-hydroxy-(11E)-octadecenoyloxy]acyl-beta-D-glucosyl-(1<->1)-sphing-4E-enine + NAD(+) = a N-[omega-(9R,10R)-epoxy-13-oxo-(11E)-octadecenoyloxy]acyl-beta-D-glucosyl-(1<->1)-sphing-4E-enine + NADH + H(+)