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Methyl 1-Boc-3-Methylpiperidine-3-carboxylate 1-tert-butyl 3-methyl 3-methylpiperidine-1,3-dicarboxylate O1-tert-butyl O3-methyl 3-methylpiperidine-1,3-dicarboxylate 1-O-tert-butyl 3-O-methyl 3-methylpiperidine-1,3-dicarboxylate 3-Methyl-1,3-piperidinedicarboxylicacid1-(1,1-dimethylethyl)3-methylester 1,3-Piperidinedicarboxylic acid, 3-methyl-, 1-(1,1-dimethylethyl) 3-methyl ester