Abstract: The chemical ingredients of a tibetan medicinal herb, collected from South Gansu Tibetan Autonomous Region in August 1986 and identified as polygo-num aubertii (L.Henry) , have boon studied. From the aerol part of this herb, seven crystalline compounds have been isolated by extraction, liquid chro-matography and fractional recrystallization. Based on the chemical and spectral (UV, IR, ¹HNMR, ¹³CNMR and MS) evidences, they were identified as α-L-butyl sorbopyranoside, 2,4-diphenylpyrrole, stagmast-4-en-3-one, stagmast-5-en-3-01-7-one, syringic acid, β-sitosterol, and tetracosanoic acid. These compounds have not been found in this herb previously.

Key words: Tibetan medicinal herb, Polygonum aubertii, a-L-butyl-sorbopyrano- side