[{"from": "human", "value": "Generate a molecule based on the given description. The molecule is an epoxide carrying methyl and vinyl substituents at position 2 (the R-enantiomer). It is an epoxide and an olefinic compound."}, {"from": "gpt", "value": "[C][C@][Branch1][Branch1][C][O][Ring1][Ring1][C][=C]"}]