| 1-tert-butoxycarbonyl-3-cyano-4-pyrrolidone |
| 1-boc-3-cyano-4-pyrrolidone |
| 1-tert-butoxycarbonyl-3-cyano-4-pyrrolidinone |
| 1-boc-3-cyano-4-pyrrolidinone |
| tert-butyl 3-cyano-4-oxopyrrolidine-1-carboxylate |
| 3-cyano-4-oxopyrrolidine-1-carboxylic acid tert-butyl ester |