[{"from": "human", "value": "Create a molecule that satisfies the conditions outlined in the description. The molecule is a mevalonate. It is a conjugate base of a (S)-mevalonic acid. It is an enantiomer of a (R)-mevalonate."}, {"from": "gpt", "value": "[C][C@][Branch1][Ring2][C][C][O][Branch1][#Branch1][C][C][=Branch1][C][=O][O-1][O]"}]