[{"from": "human", "value": "Design a molecule that meets the criteria outlined in the description. The molecule is a glycal derived from D-galactopyranose It is a glycal and an anhydrohexose."}, {"from": "gpt", "value": "[C][=C][O][C@@H1][Branch1][=Branch2][C@@H1][Branch1][Branch1][C@@H1][Ring1][=Branch1][O][O][C][O]"}]