Compound $15$ is a high$-$boiling liquid $($boiling point $220C)$ that is slightly soluble in water.. The peak at $4\mathrm{.}15ppm$ in the ${?}^{1}H$ NMR disappears if the compound is exposed to $D_{2}O.$ The Mass, $R,$ and ${?}^{1}H$ NMR spectra, along with ${?}^{13}C$ NMR data, are given below. Elemental Analysis: $C,78\mathrm{.}65$;$H,8\mathrm{.}25$;$O,13\mathrm{.}10.$ Using all of the information provided $($text and image$),$ determine the structure of the compound.