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(αS)-α-Ethyl-2-oxo-1-pyrrolidineacetic acid102849-49-030 % similar Levetiracetam acid103833-72-330 % similar 1-Pyrrolidinecarbonyl chloride1192-63-830 % similar 4-Dimethylaminobutylamine3529-10-030 % similar 4-(2-Oxo-1-pyrrolidinyl)benzaldehyde36151-45-830 % similar Di(succinimido) carbonate74124-79-130 % similar N-(Gamma-Maleimidobutyryloxy)succinimide80307-12-630 % similar