Two new kaempferol glycosides from the seeds of Camellia semiserrata Chi

Two new acetylated kaempferol glycosides were isolated from the seeds of Camellia semiserrata Chi, their structures were elucidated as kaempferol 3-O-[(3-O-acetyl)-α-l-rhamnopyranosyl(1 → 3)(4-O-acetyl)-α-l-rhamnopyranosyl(1 → 6)-β-d-gluco-pyranoside] (1) and kaempferol 3-O-[(2-O-acetyl)-α-l-rhamnopyranosyl (1 → 3)(4-O-acetyl)-α-l-rhamnopyranosyl(1 → 6)-β-d-gluco-pyranoside] (2) by spectral experiments (including ESI-MS, 1D- and 2D-NMR).