ethyl 4-(3,3-dimethyl-2,6-dioxopiperidin-1-yl)benzoate

5-甲氧基-4,4-二甲基-5-氧代戊酸

3,3-dimethylpiperidine-2,6-dione

2,2-dimethyl-4-methoxycarbonylbutanoic acid