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Five new diterpenoids isolated from Siegesbeckia pubescens, pubesides A~E, were established as ent-2a,15,16-trihydroxypimar-8(14)-en-2-O-b-D-glucopyranoside (1), ent-15,16,19-trihydroxypimar-8(14)-en-19-O-b-D-glucopyranoside (2), b-D-glucopyranosyl-ent-15