$\begin{array}{c}\\ /\end{array}\mathrm{C} = \mathrm{O}$

$\begin{array}{c}\\ /\end{array}\mathrm{C}=\mathrm{C}\begin{array}{c}/\\ \end{array}$

-CH

$-C=C-$

$\begin{array}{c}\\ /\end{array}\mathrm{C} = \mathrm{O}$

$\begin{array}{c}\\ /\end{array}\mathrm{C}=\mathrm{C}\begin{array}{c}/\\ \end{array}$

-CH

$-C=C-$

$\begin{array}{c}\\ /\end{array}\mathrm{C} = \mathrm{O}$

$\begin{array}{c}\\ /\end{array}\mathrm{C}=\mathrm{C}\begin{array}{c}/\\ \end{array}$

-CH

$-C=C-$

$\begin{array}{c}\\ /\end{array}\mathrm{C} = \mathrm{O}$

$\begin{array}{c}\\ /\end{array}\mathrm{C}=\mathrm{C}\begin{array}{c}/\\ \end{array}$

-CH

$-C=C-$

$\begin{array}{c}\\ /\end{array}\mathrm{C} = \mathrm{O}$

$\begin{array}{c}\\ /\end{array}\mathrm{C}=\mathrm{C}\begin{array}{c}/\\ \end{array}$

-CH

$-C=C-$

$\begin{array}{c}\\ /\end{array}\mathrm{C} = \mathrm{O}$

$\begin{array}{c}\\ /\end{array}\mathrm{C}=\mathrm{C}\begin{array}{c}/\\ \end{array}$

-CH

$-C=C-$

$\begin{array}{c}\\ /\end{array}\mathrm{C} = \mathrm{O}$

$\begin{array}{c}\\ /\end{array}\mathrm{C}=\mathrm{C}\begin{array}{c}/\\ \end{array}$

-CH

$-C=C-$

$\begin{array}{c}\\ /\end{array}\mathrm{C} = \mathrm{O}$

$\begin{array}{c}\\ /\end{array}\mathrm{C}=\mathrm{C}\begin{array}{c}/\\ \end{array}$

-CH

$-C=C-$

$\begin{array}{c}\\ /\end{array}\mathrm{C} = \mathrm{O}$

$\begin{array}{c}\\ /\end{array}\mathrm{C}=\mathrm{C}\begin{array}{c}/\\ \end{array}$

-CH

$-C=C-$

$\begin{array}{c}\\ /\end{array}\mathrm{C} = \mathrm{O}$

$\begin{array}{c}\\ /\end{array}\mathrm{C}=\mathrm{C}\begin{array}{c}/\\ \end{array}$

-CH

$-C=C-$

$\begin{array}{c}\\ /\end{array}\mathrm{C} = \mathrm{O}$

$\begin{array}{c}\\ /\end{array}\mathrm{C}=\mathrm{C}\begin{array}{c}/\\ \end{array}$

-CH

$-C=C-$

$\begin{array}{c}\\ /\end{array}\mathrm{C} = \mathrm{O}$

$\begin{array}{c}\\ /\end{array}\mathrm{C}=\mathrm{C}\begin{array}{c}/\\ \end{array}$

-CH

$-C=C-$

$\begin{array}{c}\\ /\end{array}\mathrm{C} = \mathrm{O}$

$\begin{array}{c}\\ /\end{array}\mathrm{C}=\mathrm{C}\begin{array}{c}/\\ \end{array}$

-CH

$-C=C-$

$\begin{array}{c}\\ /\end{array}\mathrm{C} = \mathrm{O}$

$\begin{array}{c}\\ /\end{array}\mathrm{C}=\mathrm{C}\begin{array}{c}/\\ \end{array}$

-CH

$-C=C-$

$\begin{array}{c}\\ /\end{array}\mathrm{C} = \mathrm{O}$

$\begin{array}{c}\\ /\end{array}\mathrm{C}=\mathrm{C}\begin{array}{c}/\\ \end{array}$

-CH

$-C=C-$

$\begin{array}{c}\\ /\end{array}\mathrm{C} = \mathrm{O}$

$\begin{array}{c}\\ /\end{array}\mathrm{C}=\mathrm{C}\begin{array}{c}/\\ \end{array}$

-CH

$-C=C-$

$\begin{array}{c}\\ /\end{array}\mathrm{C} = \mathrm{O}$

$\begin{array}{c}\\ /\end{array}\mathrm{C}=\mathrm{C}\begin{array}{c}/\\ \end{array}$

-CH

$-C=C-$

$\begin{array}{c}\\ /\end{array}\mathrm{C} = \mathrm{O}$

$\begin{array}{c}\\ /\end{array}\mathrm{C}=\mathrm{C}\begin{array}{c}/\\ \end{array}$

-CH

$-C=C-$

$\begin{array}{c}\\ /\end{array}\mathrm{C} = \mathrm{O}$

$\begin{array}{c}\\ /\end{array}\mathrm{C}=\mathrm{C}\begin{array}{c}/\\ \end{array}$

-CH

$-C=C-$

$\begin{array}{c}\\ /\end{array}\mathrm{C} = \mathrm{O}$

$\begin{array}{c}\\ /\end{array}\mathrm{C}=\mathrm{C}\begin{array}{c}/\\ \end{array}$

-CH

$-C=C-$

$\begin{array}{c}\\ /\end{array}\mathrm{C} = \mathrm{O}$

$\begin{array}{c}\\ /\end{array}\mathrm{C}=\mathrm{C}\begin{array}{c}/\\ \end{array}$

-CH

$-C=C-$

$\begin{array}{c}\\ /\end{array}\mathrm{C} = \mathrm{O}$

$\begin{array}{c}\\ /\end{array}\mathrm{C}=\mathrm{C}\begin{array}{c}/\\ \end{array}$

-CH

$-C=C-$

$\begin{array}{c}\\ /\end{array}\mathrm{C} = \mathrm{O}$

$\begin{array}{c}\\ /\end{array}\mathrm{C}=\mathrm{C}\begin{array}{c}/\\ \end{array}$

-CH

$-C=C-$

$\begin{array}{c}\\ /\end{array}\mathrm{C} = \mathrm{O}$

$\begin{array}{c}\\ /\end{array}\mathrm{C}=\mathrm{C}\begin{array}{c}/\\ \end{array}$

-CH

$-C=C-$

$\begin{array}{c}\\ /\end{array}\mathrm{C} = \mathrm{O}$

$\begin{array}{c}\\ /\end{array}\mathrm{C}=\mathrm{C}\begin{array}{c}/\\ \end{array}$

-CH

$-C=C-$

$\begin{array}{c}\\ /\end{array}\mathrm{C} = \mathrm{O}$

$\begin{array}{c}\\ /\end{array}\mathrm{C}=\mathrm{C}\begin{array}{c}/\\ \end{array}$

-CH

$-C=C-$

$\begin{array}{c}\\ /\end{array}\mathrm{C} = \mathrm{O}$

$\begin{array}{c}\\ /\end{array}\mathrm{C}=\mathrm{C}\begin{array}{c}/\\ \end{array}$

-CH

$-C=C-$

$\begin{array}{c}\\ /\end{array}\mathrm{C} = \mathrm{O}$

$\begin{array}{c}\\ /\end{array}\mathrm{C}=\mathrm{C}\begin{array}{c}/\\ \end{array}$

-CH

$-C=C-$

$\begin{array}{c}\\ /\end{array}\mathrm{C} = \mathrm{O}$

$\begin{array}{c}\\ /\end{array}\mathrm{C}=\mathrm{C}\begin{array}{c}/\\ \end{array}$

-CH

$-C=C-$

$\begin{array}{c}\\ /\end{array}\mathrm{C} = \mathrm{O}$

$\begin{array}{c}\\ /\end{array}\mathrm{C}=\mathrm{C}\begin{array}{c}/\\ \end{array}$

-CH

$-C=C-$

$\begin{array}{c}\\ /\end{array}\mathrm{C} = \mathrm{O}$

$\begin{array}{c}\\ /\end{array}\mathrm{C}=\mathrm{C}\begin{array}{c}/\\ \end{array}$

-CH

$-C=C-$

$\begin{array}{c}\\ /\end{array}\mathrm{C} = \mathrm{O}$

$\begin{array}{c}\\ /\end{array}\mathrm{C}=\mathrm{C}\begin{array}{c}/\\ \end{array}$

-CH

$-C=C-$

$\begin{array}{c}\\ /\end{array}\mathrm{C} = \mathrm{O}$

$\begin{array}{c}\\ /\end{array}\mathrm{C}=\mathrm{C}\begin{array}{c}/\\ \end{array}$

-CH

$-C=C-$

$\begin{array}{c}\\ /\end{array}\mathrm{C} = \mathrm{O}$

$\begin{array}{c}\\ /\end{array}\mathrm{C}=\mathrm{C}\begin{array}{c}/\\ \end{array}$

-CH

$-C=C-$