[{"from": "human", "value": "Generate a molecule based on the given description. The molecule is the ketoaldonic acid derivative that is N-acetylneuraminic acid after formal dehydroxylation and subsequent removal of C-8 and C-9. It is functionally related to a N-acetylneuraminic acid."}, {"from": "gpt", "value": "[C][C][=Branch1][C][=O][N][C@@H1][C@H1][Branch2][Ring1][Ring1][C][C][Branch1][#Branch1][O][C@H1][Ring1][=Branch1][C][O][Branch1][=Branch1][C][=Branch1][C][=O][O][O][O]"}]