6-Bromo-3,4-dihydro-4-oxo-spiro[2H-1-benzopyran-2,3'-pyrrolidine]-1'-carboxylic acid 1,1-dimethylethyl ester 1g

6-Bromo-3,4-dihydro-4-oxo-spiro[2H-1-benzopyran-2,3'-pyrrolidine]-1'-carboxylic acid 1,1-dimethylethyl ester 1g