Compound #7:MW=84 NMR ppm \begin{tabular}{|l|c|c|c|l|l|l|} \hline Signal & 8, observed & 8, calculated & multiplicity & Integrationratio & \# of H & note \\ \hline a & 1.5 & & s & 6 & & \\ \hline b & 2.3 & & s & 1 & & \\ \hline c & 2.4 & & s & 1 & & \\ \hline \end{tabular}