2-tert-Butyl-3-oxo-4,4-dimethylvaleric acid ethyl ester
2-tert-Butyl-3-oxo-4,4-dimethylvaleric acid ethyl ester ??
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2-tert-Butyl-3-oxo-4,4-dimethylvaleric acid ethyl ester C??? ??, ??, ??
2-tert-Butyl-3-oxo-4,4-dimethylvaleric acid ethyl ester ?? ?? ? ???
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2-tert-Butyl-3-oxo-4,4-dimethylvaleric acid ethyl ester ?? ??
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