7a-(dimethylamino)-4',4',5',5'-tetramethyldihydro-2l5-spiro[pyrrolo[1,2-d][1,3,4,2]dioxazaphosphole-2,2'-[1,3,2]dioxaphospholan]-5(6H)-one

(2,5-dioxopyrrolidin-1-yl) 3-(tritylamino)propanoate

1-羟基吡咯烷

己二酸 1,6-二(2,5-二氧代-1-吡咯烷基)酯

(2,5-dioxopyrrolidin-1-yl) 2-bromo-2-phenylacetate