Pramiracetam68497-62-1100 % similar Nefiracetam77191-36-748 % similar 2-Oxo-1-pyrrolidineacetic acid53934-76-246 % similar Piracetam7491-74-944 % similar Methyl 2-oxo-1-pyrrolidineacetate59776-88-440 % similar N-(Hydroxymethyl)-2-pyrrolidone15438-71-839 % similar N-Ethyl-2-pyrrolidone2687-91-439 % similar 1-(2-Hydroxyethyl)-2-pyrrolidinone3445-11-238 % similar N-Butyl-2-pyrrolidone3470-98-238 % similar 1-(3-Hydroxypropyl)-2-pyrrolidinone62012-15-138 % similar Coluracetam135463-81-936 % similar N-Octylpyrrolidone2687-94-736 % similar N-Dodecyl-2-pyrrolidone2687-96-936 % similar 1-(3-Aminopropyl)-2-pyrrolidinone7663-77-635 % similar Fasoracetam110958-19-535 % similar Laurocapram59227-89-333 % similar 1-Acetyl-2-imidazolidinone5391-39-933 % similar N1,N1,N6,N6-Tetrakis(2-hydroxyethyl)hexanediamide6334-25-433 % similar 1-Acetyl-2-pyrrolidone932-17-233 % similar Levetiracetam acid103833-72-332 % similar