Abstract: Mogroside Ⅲ was isolated from the fruit of Momordica grosvenori Swingle[Siraitia grosvenorii(Swingle) C. Jeffery]. Mogrol (9β-methyl-19-norlanost-5-ene-3β，11α，24β, 25-tetrol) was derived from mogroside Ⅲ by mild enzymatic hydrolysis. One-dimensional and two-dimensional NMR(including gCOSY，gNOESY，gHSQC and gHMBC) techniques were employed to assign the chemical shifts and elucidate the structures of the compounds. The effects of the substitutent groups on the ¹H and ¹³C chemical shifts of the mogroside were also discussed.

Key words: NMR, structure, mogrol, mogrosides, Momordica grosvenori