Seven new pentasaccharides from the roots of Rehmannia glutinosa .

Seven new pentasaccharides ( 1 - 7 ), rehmaglupentasaccharides A-G, were isolated from the air-dried roots of Rehmannia glutinosa . Their structures were established from the spectroscopic data obtained and by chemical evidence. The known verbascose ( 8 ) and stachyose ( 9 ) were also obtained in the current investigation, and the structure of stachyose was unequivocally defined using X-ray diffraction data. Compounds 1 - 9 were tested for their cytotoxicity against five human tumor cell lines, influence on dopamine receptor activation, and proliferation effects against Lactobacillus reuteri .