Give the structure that corresponds to the following molecular formula and NMR spectra: C6H14O \begin{tabular}{|l|l|} \hline1 H NMR & 0.91(6H,d,J=7Hz);1.17(6H,s);1.48(1H,s; disappears after D/O2 shake );1.65(1H, septet, J=7Hz). \\ \hline13C NMR & 17.6,26.5,838.7,873.2. \\ \hline \end{tabular} Draw the structure