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.
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Boc-D-Pyroglutamic acid tere-butyl ester
pharmaceutical intermediate
(S)-N-Boc-2-pyrrolidone-5-carboxylic acid tert-butyl ester
pharmaceutical intermediate
Boc-L-Pyroglutamic acid methyl ester
pharmaceutical intermediate
N-[(9H-Fluoren-9-ylmethoxy)carbonyl]-L-aspartic acid 1-methyl ester
pharmaceutical intermediate
T-Butyl (3S)-3-fluoro-4-oxopiperidine-1-carboxylate
pharmaceutical intermediate
((1R,2S)-2-(3-fluorophenyl)-2-((tosyloxy)methyl)cyclopropyl)methyl acetate
pharmaceutical intermediate
2-Bromo-4'-methylpropiophenone
pharmaceutical intermediate
Ethyl Boc-D-pyroglutamate
pharmaceutical intermediate
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
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