Trimethylpyruvic acid3,3-Dimethyl-2-oxobutanoic acid三甲基丙酮酸Trimethylpyruvic acid3,3-Dimethyl-2-oxobutyric acid2-oxo-3,3-dimethylbutanoic acid2-oxo-3,3-dimethylbutyric acidtrimethylpyruvic acidtrimethylpyroracemic acid3,3-dimethyl-2-oxobutanoic acid3,3-dimethyl-2-oxobutyric acidbeta,beta-dimethyl-alpha-oxo-butyric acidtert-butylglyoxylic acid