(2-((2-(2，6-二氧代哌啶-3-基)-1，3-二氧代异吲哚啉-4-基)氧基)乙酰氨基)丁酸叔丁酯

(2-((2-(2，6-二氧代哌啶-3-基)-1，3-二氧代异吲哚啉-4-基)氧基)乙酰氨基)丁酸叔丁酯

tert-butyl4-(2-((2-(2，6-dioxopiperidin-3-yl)-1，3-dioxoisoindolin-4-yl)oxy)acetamido)butanoate