[{"from": "human", "value": "Create a molecule that satisfies the conditions outlined in the description. The molecule is a crown ether that is cyclononane in which the carbon atoms at positions 1, 4, and 7 have been replaced by oxygen atoms. It is a crown ether and a saturated organic heteromonocyclic parent."}, {"from": "gpt", "value": "[C][C][O][C][C][O][C][C][O][Ring1][=Branch2]"}]