(S)-alpha-Ethyl-2-oxo-1-pyrrolidineacetamide 1-Pyrrolidineacetamide, alpha-ethyl-2-oxo-, (S)- 102767-28-2 Keppra LEVITIRACETAM Levetiracetam Levetiracetam [INN] Levetiracetamum [INN-Latin] UCB-L 059