[{"from": "human", "value": "Generate a molecule based on this description. The molecule is a 2-bromo-N-carbamoyl-3-methylbutanamide that has S configuration. It is an enantiomer of a (R)-bromisoval."}, {"from": "gpt", "value": "[C][C][Branch1][C][C][C@@H1][Branch1][O][C][=Branch1][C][=O][N][C][=Branch1][C][=O][N][Br]"}]