Study on the Structure of a New Triterpene Saponin B from Polygala japoniea Houtt Chemical constituents from whole herb of Hedyotis scandens Chemical constituents from whole herb of Hedyotis scandens Chemical constituents of Salvia plebaia Studies on the Structures of Two New Triterpene Saponins C and D from Polygala japoni-ca Houtt Chemical constituents of Salvia plebaia Chemical constituents from aerial parts of Artemisia dracunculus var. turkestanica