A new cytisine-type alkaloid from the stem bark of Maackia amurensis

One new cytisine-type alkaloid, [(3-hydroxy-6-pyridinyl)-methyl]-cytisine (1), was isolated from the stem bark of Maackia amurensis, together with five known alkaloids: cytisine (2), N-formylcytisine (3), N-(3-oxobutyl)cytisine (4), (−)-epibaptifoline (5) and N-methylcytisine (6). The structure of 1 was elucidated based on spectral methods (IR, CD, 1D and 2D NMR, HR-ESI-MS and EI-MS).