3,7-Diazabicyclo[3.3.1]nonane-3,7-dicarboxylic acid, 9-oxo-, bis(1,1-dimethylethyl) ester Bis(2-methyl-2-propanyl) 9-oxo-3,7-diazabicyclo[3.3.1]nonane-3,7-dicarboxylate MFCD28016263