本發明係有關於一種口服配方,其含有效劑量之以下式I化合物: d-α-維生素E聚乙二醇1000琥珀酸酯;以及2-(2-乙氧基乙氧基)乙醇,R1 至R4 及n定義於文中。本發明亦揭露一種治療癌症的方法,藉由口服投遞此式化合物給一主體。This invention relates to an oral formulation containing an effective amount of the compound of the following formula I:d-alpha-tocopheryl polyethylene glycol 1000 succinate (“TPGS”); and 2-(2-ethoxyethoxy)ethanol (“Transcutol”). R1 through R4 and n are defined herein. Also disclosed is a method of treating cancer by administering this formula to a subject orally.