1,2-Piperidinedicarboxylic acid, 2-methyl-, 1-(1,1-dimethylethyl) ester
1-[(tert-Butoxy)carbonyl]-2-methylpiperidine-2-carboxylic acid
1-(tert-Butoxycarbonyl)-2-methylpiperidine-2-carboxylic acid
2-Methyl-1-[(2-methylpropan-2-yl)oxycarbonyl]piperidine-2-carboxylic acid