2,5-二氧代吡咯烷-1-基4-氟苯甲酸

(2,5-dioxopyrrolidin-1-yl) 4-cyanobenzoate

(2,5-dioxopyrrolidin-1-yl) 2-methoxybenzoate

(2,5-二氧代吡咯烷-1-基)4-碘苯甲酸酯