[{"from": "human", "value": "Generate a molecule based on the given description. The molecule is the (S)-enantiomer of flavan. It is an enantiomer of a (2R)-flavan."}, {"from": "gpt", "value": "[C][C][C][=C][C][=C][C][=C][Ring1][=Branch1][O][C@@H1][Ring1][#Branch2][C][=C][C][=C][C][=C][Ring1][=Branch1]"}]