A new secoiridoid glycoside from Picrorhiza scrophulariiflora Studies on chemical constituents of Syringa pubescens (Ⅰ) Secoiridoid glycosides from Flos Lonicerae Glycosides from Swertia erythrosticta Studies on chemical constituents of aqueous extract of Lonicera japonica flower buds Glycoside constituents from Swertia franchetia na