[{"from": "human", "value": "Based on the given information, design a molecule that meets the desired specifications. The molecule is an ether having ethyl and tert-butyl as the two alkyl components. It is used as an engine fuel additive to reduce emissions of carbon monoxide and soot. It has a role as a fuel additive. It is an ether and a volatile organic compound."}, {"from": "gpt", "value": "[C][C][O][C][Branch1][C][C][Branch1][C][C][C]"}]