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(S)-N-Boc-2-pyrrolidone-5-carboxylic acid tert-butyl ester
pharmaceutical intermediate
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N-Butoxycarbonyl-5-oxo-L-proline ethyl ester is a protected amino acid derivative used as a pharmaceutical intermediate in peptide synthesis. Its crystalline structure has been characterized by single-crystal X-ray diffraction.
Content scope: Information here supports chemical identification and industrial supply, research, and manufacturing contexts. It is not a therapeutic claim, medical advice, or drug-use instructions.
The international HS code for 1-(1,1-Dimethylethyl) 2-ethyl (2S)-5-oxo-1,2-pyrrolidinedicarboxylate (CAS 144978-12-1) is 2933.79.
2933.79
2933 79 00
Classification per the EU customs inventory ECICS (2026-07 snapshot, HS 2022). National tariff lines and product form can affect the final classification.
1-O-tert-butyl 2-O-ethyl (2S)-5-oxopyrrolidine-1,2-dicarboxylate
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CCOC(=O)[C@@H]1CCC(=O)N1C(=O)OC(C)(C)C