D-ribose + nicotinamide + H(+) => beta-nicotinamide D-riboside + H2O
d-ribose + nicotinamide + h(+) => beta-nicotinamide d-riboside + h2o
D-ribose + nicotinamide + H(+) => beta-nicotinamide D-riboside + H2O
d-ribose + nicotinamide + h(+) => beta-nicotinamide d-riboside + h2o