I'm trying to type a column with seven elements and some vertical big braces on its left and right. The code I use is
\[
\begin{array}{rcl}
& \Gamma & \\
\multirow{3}{*}{$\mathcal{D}_3 \bigg\{$}
& \mathcal{D}_1 & \\
& A & \\
& \mathcal{D}_2 & \multirow{2}{*}{$\bigg\} \mathcal{D}_5$} \\
& B & \\
& \mathcal{D}_4 & \\
& C &
\end{array}
\]
which produces
but I'd like to produce bigger and closer to the middle column braces such that the one on the left includes elements D_1 to D_2 and the one on the right includes D_2 to D_4.
Could anyone help?