[{"from": "human", "value": "Synthesize a molecule that matches the given characteristics. The molecule is a member of the class of oxanes carrying a vinyl substituent at position 2 as well as three methyl substituents at positions 2, 6 and 6. It is a member of oxanes and an olefinic compound."}, {"from": "gpt", "value": "[C][C][Branch1][#C][C][C][C][C][Branch1][Ring2][O][Ring1][=Branch1][Branch1][C][C][C][=C][C]"}]