a class of compounds containing a lactam ring fused with a spiro ring
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1,2-Pyrrolidinedicarboxylic acid, 2-(2-propenyl)-, 1-(1,1-dimethylethyl) 2-methyl ester, (R)-
2-methyl-2-[methyl-(1-phenylethyl)-carbamoyl]-pyrrolidine-1-carboxylic acid tert-butyl ester
