Sesquiterpenoid Glycosides from the Fruits of Chaenomeles speciosa

A new sesquiterpenoid glycoside, called speciosaoside A ( 1 ), and a known sesquiterpenoid glycoside, (1′R,3′R,5′R,8′S)-epi-dihydrophaseic acid β-D-glucoside ( 2 ), were isolated from the fruits of Chaenomeles speciosa (Sweet) Nakai (Rosaceae) using column chromatography and preparative HPLC. The structure of compound 1 was deduced from comprehensive spectroscopic analysis including IR, HR-ESI-MS, 1D NMR, and 2D NMR. The structure of compound 2 was identified by comparison of its spectral data with those reported in the literature.