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基于 PubChem CID 索引，支持名称 / 同义词 / CAS / SMILES 检索。
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1-Pyrrolidineacetic acid, a-ethyl-2-oxo-, (aS)-; 1-Pyrrolidineacetic acid, a-ethyl-2-oxo-, (S)-; (aS)-a-Ethyl-2-oxo-1-pyrrolidineacetic acid; 2-Pyrrolidinone-n-butyric acid; UCB-L 057; Levetiracetam Carboxylic Acid; Levetiracetam acid CAS 102849-49-0 PubChem CID 11607993
CC[C@@H](C(=O)O)N1CCCC1=O