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A new dammarane saponin, Gycomoside I was isolated from Gynostemma compressum and elucidated as 1β, 3β, 12β,20(S), 26-pentahydroxy-dammar-24(25)-en-20(S)-O-β-D-glucopyranosyl6-β-D-glucopyranoside based on the chemical and spectral evidences.