The polymer iridoid glucosides isolated from Dipsacus asper

Abstract Two new iridoid tetramers with four glucosides, dipsanosides H ( 1 ) and I ( 2 ), as well as one new bis-iridoid glucosides dipsanosides J ( 3 ), along with four known polymer iridoid glycosides dipsanosides A ( 4 ) and B ( 5 ), pterocephaline ( 6 ), triplostoside A ( 7 ) were isolated from Dipsacus asper . Their structures were determined by analysis of 1D and 2D NMR data. All of them were found to be inactive in anti-inflammatory activity.