(R)-6-hydroxynicotine + AH2 => (R)-nicotine + A + H2O
(r)-6-hydroxynicotine + ah2 => (r)-nicotine + a + h2o
(R)-6-hydroxynicotine + AH2 => (R)-nicotine + A + H2O
(r)-6-hydroxynicotine + ah2 => (r)-nicotine + a + h2o