[{"from": "human", "value": "Could you give me a brief overview of this molecule? [C][=C][C][O][C@@][Branch2][Branch1][=Branch1][C][C@H1][Branch2][Ring2][S][C@H1][Branch2][Ring2][O][C@H1][Branch1][Ring2][O][Ring1][=Branch1][C@H1][C][O][C@@][Branch2][Ring1][=Branch1][C][C@H1][Branch1][P][C@H1][Branch1][=N][C@H1][Branch1][Ring2][O][Ring1][=Branch1][C@@H1][Branch1][Ring1][C][O][O][O][O][C][=Branch1][C][=O][O][Ring2][Ring1][C][O][O][C][=Branch1][C][=O][O-1].[Na+1]"}, {"from": "gpt", "value": "The molecule is the sodium salt of a carbohydrate lactone formed from alpha-Kdo-(2->8)-alpha-Kdo-OAll by lactone formation between the carboxy group of the non-reducing alpha-Kdo residue and O-7 of the alpha-Kdo-OAll residue. It contains an alpha-Kdo-(2->8)-alpha-Kdo-OAll(1-) II(1),I(7)-lactone."}]