Chemical Structure of an Acylated Oleanane-type Triterpene Oligoglycoside and Anti-inflammatory Constituents from the Flower Buds of Camellia sinensis

A new acylated oleanane-type triterpene oligoglycoside, floratheasaponin K (1), was isolated together with 11 known compounds including floratheasaponins D (2)–G (5), and I (6), chakasaponin V (7), and assamsaponin E (8) from the flower buds of Camellia sinensis cultivated in India. The chemical structure of floratheasaponin K (1) was elucidated on the basis of chemical and physicochemical evidence. In addition, chakasaponins V (7) and I (13) significantly inhibited nitric oxide (NO) production in lipopolysaccharide- (LPS) activated RAW264.7 cells without cytotoxicity.