1-Oxo-2,9,13-triaza-dispiro[4.0.5.3]tetradecane-9,13-dicarboxylic acid 13-benzyl ester 9-tert-butyl ester 1g

1-Oxo-2,9,13-triaza-dispiro[4.0.5.3]tetradecane-9,13-dicarboxylic acid 13-benzyl ester 9-tert-butyl ester 1g