[{"from": "human", "value": "Based on the given information, design a molecule that meets the desired specifications. The molecule is a fenchone that has 1S,4R stereochemistry. A colourless, oily liquid found in fennel oil, it is used in perfumery and as flavour in foods. It is an enantiomer of a (1R,4S)-fenchone."}, {"from": "gpt", "value": "[C][C@][C][C][C@H1][Branch1][Ring2][C][Ring1][Branch1][C][Branch1][Branch1][C][Ring1][#Branch1][=O][Branch1][C][C][C]"}]