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Inspired by our previous finding that disesquiterpenoids showed more potent antihepatoma cytotoxicity than their corresponding parent monomers, natural product‐like guaianolide‐germacranolide heterodimers were designed and synthesized from guaianolide diene and germacranolides via a biomimetic Diels–Alder reaction to provide three antihepatoma active dimers with novel scaffolds. To explore the structure–activity...