All-carbon quaternary center containing tetrahydro-5H-benzo[c]fluorenes via highly stereoselective transannular carbocation cyclization

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JAK2/STAT3‑mediated dose‑dependent cytostatic and cytotoxic effects of sesquiterpene lactones from Gymnanthemum extensum on A549 human lung carcinoma cells. Keeratichamroen S, Lirdprapamongkol K, Thongnest S, Boonsombat J, Chawengrum P, Sornprachum T, Sirirak J, Verathamjamras C, Ornnork N, Ruchirawat S, Svasti J. Oncol Rep. 2022 Jan;47(1):6.