Six previously undescribed ent-kaurane diterpenoids, including two 6,7-seco-ent-kaurane diterpenoids (1–2), four 7,20-epoxy-ent-kaurane diterpenoids (3–6) were isolated from I. rubescens.
Four previously undescribed compounds including a tetrahydrofuran lignan (1), a 7,9′-dinorlignan glucoside (2), and two clerodane diterpenoid glucosides (3–4), together with 18 known compounds were isolated from Tinospora sinensis.
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