[{"from": "human", "value": "Synthesize a molecule that matches the given characteristics. The molecule is a lactone. It derives from a hydride of an oxazolo[4,5-b]pyridine."}, {"from": "gpt", "value": "[C][=C][C][=C][Branch1][=Branch2][N][C][=Branch1][C][=O][O][Ring1][=Branch1][N][=C][Ring1][#Branch2]"}]