[{"from": "human", "value": "Design a molecule that meets the criteria outlined in the description. The molecule is a gamma-valerolactone. It is an enantiomer of a (R)-gamma-valerolactone."}, {"from": "gpt", "value": "[C][C@H1][C][C][C][=Branch1][C][=O][O][Ring1][=Branch1]"}]