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A new diterpenoid trisaccharide, smithoside A, was isolated from Aster smithianus. Its structure was identified as pimar-15 (16)-β-en-3β, 8β, 1 1α-triol-3-O-β-D-glucopyranosyl (l→3)-[β-glucopyranosyl (1→2)]-β-D-glucopyranoside on the basis of the spectral and chemical methods.