Characteristic polynomial
$$\begin{equation}\left(\lambda + 2\right)^{2} \left(\lambda + 3\right) \left(\lambda^{2} + 4 \lambda + 8\right) \left(\lambda^{8} - 6 \lambda^{7} - 47 \lambda^{6} - 68 \lambda^{5} + 104 \lambda^{4} - 10688 \lambda^{3} - 40704 \lambda^{2} - 18432 \lambda + 263168\right)\notag\end{equation}$$
Minimal polynomial
$$\begin{equation}\left(\lambda + 2\right) \left(\lambda + 3\right) \left(\lambda^{2} + 4 \lambda + 8\right) \left(\lambda^{8} - 6 \lambda^{7} - 47 \lambda^{6} - 68 \lambda^{5} + 104 \lambda^{4} - 10688 \lambda^{3} - 40704 \lambda^{2} - 18432 \lambda + 263168\right)\notag\end{equation}$$
Quantum multiplication matrix
$$\begin{equation}\begin{pmatrix}0 & 4 & 0 & 8 & 0 & 12 & 6 & 6 & 9 & 8 & 8 & 12 & 20 \\ 1 & -1 & 0 & 2 & 0 & 4 & 0 & 0 & 2 & 6 & 6 & 3 & 8 \\ 2 & 0 & 0 & 2 & 4 & 4 & 8 & -2 & 4 & 12 & 0 & 6 & 0 \\ 1 & 1 & 0 & 0 & 0 & 4 & 0 & 2 & 2 & 0 & 0 & 3 & 4 \\ 0 & 2 & 1 & -1 & -1 & 1 & 2 & 0 & 1 & 4 & -2 & 2 & 0 \\ 0 & 1 & 0 & 2 & 0 & 0 & 0 & 0 & 1 & 0 & 2 & 0 & 3 \\ 0 & 0 & 1 & 3 & 1 & 1 & 0 & 0 & 1 & 4 & 0 & 2 & 0 \\ 0 & 0 & 2 & 0 & 0 & 0 & 2 & 0 & 1 & 4 & 4 & 4 & 6 \\ 0 & 0 & 0 & 0 & 0 & 0 & 0 & 0 & -2 & 0 & 0 & 0 & 0 \\ 0 & 0 & 0 & 0 & 1 & 3 & -1 & -1 & \frac{1}{2} & -1 & -1 & 0 & -2 \\ 0 & 0 & 0 & 0 & 2 & 0 & 2 & 2 & 0 & 2 & 0 & 2 & 4 \\ 0 & 0 & 0 & 0 & 0 & 0 & 6 & 2 & 3 & 2 & 2 & 0 & 4 \\ 0 & 0 & 0 & 0 & 0 & 0 & 0 & 0 & 0 & 6 & 2 & 4 & 0\end{pmatrix}\notag\end{equation}$$