New natural saponins from fruits of Momordica grosvenori Grosmomoside Ⅰ, a new cucurbitane triterpenoid glycoside from fruits of Momordica grosvenori Determination of mogroside V and 11-oxomogroside V in dried mature fruits of Momordica grosvenori by HPLC Rapid propagation ofMomordica grosvenori virus-free plantlets