Three new resin glycosides, purginosides I and II (1 and 2)and purgin I(3), were isolated from the aerial parts of Ipomoea purga and purified by preparative-scale recycling HPLC from a chloroform-soluble extract. Their structures were established through NMR spectroscopy and mass spectrometry. Purginosides I and II (1 and 2) are partially acylated branched pentasaccharides derived from operculinic acid A, which is composed of one D-fucose, one D-glucose, and three L-rhamnose units. The site of the aglycon macrolactonization is at C-2 of the second saccharide (rhamnose). Inboth compounds 1 and 2, three different esterifying residueswere locatedatC-2of the second rhamnoseunit and at C-2 (or C-3) and C-4 on the third rhamnosemoiety