The present invention relates to a novel application of a compound. The compound 4-hydroxy-2,3-dimethoxy-6-methyl-5-(3,7,11-trimethyl-dodeca-2,6,10-trienyl)-cyclohex-2-enone of the invention is isolated and purified from the extracts of Antrodia camphorata, which can be applied for inhibiting the survival of oral cavity cancer cells and be used as a pharmaceutical composition to inhibit the oral cavity tumor growth.本發明係關於一種化合物之新用途，本發明係由牛樟芝萃取物中分離純化而得4-羥基-2,3-二甲氧基-6-甲基-5(3,7,11-三甲基-2,6,10-十二碳三烯)-2-環己烯酮(4-hydroxy-2,3-dimethoxy-6-methy-5(3,7,11-trimethyl-dod eca-2,6,10-trienyl)-cyclohex-2-enone)，該環己烯酮化合物可應用於抑制口腔癌腫瘤細胞之生長，同時可應用於抑制口腔癌腫瘤細胞生長之醫藥組成物中。
