(2S)-2-[(4R)-2-oxo-4-propylpyrrolidin-1-yl]butanamide (2S)-2-[(4R)-2-oxo-4-propyl-pyrrolidin-1-yl]butanamide (2S)-2-[(4R)-2-oxo-4-propyl-1-pyrrolidinyl]butanamide (2S)-2-[(4R)-2-keto-4-propyl-pyrrolidin-1-yl]butyramide Brivaracetam Rikelta UCB-34714