This invention discloses a compound, a pharmaceutical composition, a use and a process extracting from Eriobotrya japonica leaf thereof. The compound methyl 2α- O-( E)- p-methoxycinnamoyl-3β-hydroxy-urs-12-en-28-oate is presented as formula (I): (I)本發明揭露一種化合物及其醫藥組合物、用途及萃取自枇杷葉之方法,該化合物methyl 2α- O-( E)- p-methoxycinnamoyl-3β-hydroxy-urs-12-en-28-oate如式(I)所示: (I)10 式(I)化合物萃取自枇杷葉之方法 11 乾燥步驟 12 抽取步驟 13 第一濃縮步驟 14 分離步驟 15 第二濃縮步驟 16 純化步驟