[{"from": "human", "value": "Synthesize a molecule that matches the given characteristics. The molecule is a natural product found in Xestospongia testudinaria with data available."}, {"from": "gpt", "value": "[C][O][C][=Branch1][C][=O][C][C][C][C][#C][C][#C][C][C][C][C][C][C][C][#C][C][=C][Br]"}]