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Five new modified eremophilane-type sesquiterpenes (1-5), including three norsesquiterpenes (1-3), and one new monoterpene (6) were isolated from the aerial parts of Parasenecio deltophylla. Their structures were established on the basis of HRMS and NMR methods. The cytotoxicity of compounds 1-4 and 6 against selected cancer cell lines, including human promyelocytic leukemia (HL-60) and human hepatoma (Hep-G2), was evaluated. Antioxidant activities of these compounds were assessed by ABTS and DPPH methods.

Four new compounds, 9α‐hydroxy‐1β‐methoxycaryolanol (1), stigmast‐5‐ene‐7α,22α‐diol‐3β‐tetradecanoate (2), 7‐O‐(6′‐acetoxy‐β‐D‐glucopyranosyl)coumarin (3), and 8‐O‐(6′‐acetoxy‐β‐D‐glucopyranosyl)‐7‐hydroxycoumarin (4), together with ten known compounds, were isolated from the aerial parts of Sinacalia tangutica. The structures of the new compounds were established by means of extensive spectroscopic analyses (1D‐ and 2D‐NMR, EI‐MS, HR‐ESI‐MS, as well as IR and UV) and by comparison of their spectroscopic data with those of structurally related compounds reported in the literature.

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