[{"from": "human", "value": "Synthesize a molecule that matches the given characteristics. The molecule is the first member of marine polycyclic ethers to be structurally elucidated and one of the most potent neurotoxins. The structural feature of this compound is a trans-fused polycyclic ether ring system with 23 stereocenters, which contains six-, seven-, and eight-membered ether rings, three carbon-carbon double bonds, one hydroxyl group, and two carbonyl groups  (A3250)."}, {"from": "gpt", "value": "[C][C@@H1][C][C@H1][C@@H1][Branch2][Ring1][P][C][C@][Branch2][Ring1][O][C@H1][Branch1][Ring2][O][Ring1][=Branch1][C][C@H1][C@H1][Branch1][Ring2][O][Ring1][#Branch1][C][=Branch1][=Branch2][=C][C][=Branch1][C][=O][O][Ring1][Branch2][C][C][O][C@@H1][C@@H1][Ring2][Ring1][=Branch1][O][C@H1][C][C@@H1][C@][Branch2][Branch1][=N][C][C@@H1][C@@][Branch1][Ring2][O][Ring1][=Branch1][Branch2][Ring2][P][C][/C][=C][\\C@@H1][C@@H1][Branch1][Ring2][O][Ring1][=Branch2][C][C@@H1][C@@H1][Branch1][Ring2][O][Ring1][#Branch1][C][C@@H1][C@@][Branch1][Ring2][O][Ring1][#Branch1][Branch2][Ring1][Ring1][C@H1][Branch1][#C][C][C@H1][Branch1][Ring2][O][Ring1][#Branch1][C][C][=Branch1][C][=C][C][=O][O][C][C][Branch1][=C][O][C@@][Ring2][Ring2][Ring2][Branch1][=Branch1][C][C][Ring2][Ring2][=Branch2][C][C]"}]