Characteristic polynomial
$$\begin{equation}\lambda \left(\lambda + 1\right) \left(\lambda + 4\right)^{3} \left(\lambda + 5\right)^{2} \left(\lambda - 4\right) \left(\lambda^{5} - 11 \lambda^{4} - 140 \lambda^{3} + 176 \lambda^{2} + 4224 \lambda + 7488\right)\notag\end{equation}$$
Minimal polynomial
$$\begin{equation}\lambda \left(\lambda + 1\right) \left(\lambda + 4\right)^{2} \left(\lambda + 5\right) \left(\lambda - 4\right) \left(\lambda^{5} - 11 \lambda^{4} - 140 \lambda^{3} + 176 \lambda^{2} + 4224 \lambda + 7488\right)\notag\end{equation}$$
Quantum multiplication matrix
$$\begin{equation}\begin{pmatrix}0 & 4 & 12 & 16 & 12 & 24 & 60 & 24 & 48 & 96 & 32 & 192 & 240 \\ 1 & -1 & 0 & 2 & 12 & 12 & 8 & 0 & 12 & 48 & 24 & 48 & 96 \\ 1 & 0 & 0 & 2 & 4 & 4 & 16 & 8 & 8 & 24 & 12 & 48 & 64 \\ 1 & 1 & 2 & 0 & 0 & 4 & 12 & 4 & 12 & 12 & 0 & 36 & 32 \\ 0 & 1 & 1 & 0 & -1 & 2 & 2 & 0 & 2 & 12 & 8 & 12 & 24 \\ 0 & 1 & 0 & 1 & 2 & -1 & 0 & 0 & 2 & 12 & 4 & 8 & 24 \\ 0 & 0 & 1 & 1 & 1 & 0 & 0 & 2 & 2 & 4 & 0 & 12 & 12 \\ 0 & 0 & 1 & 0 & 0 & 0 & 2 & -2 & 0 & 4 & 4 & 8 & 12 \\ 0 & 0 & 0 & 1 & 0 & 1 & 2 & 0 & -2 & 0 & 0 & 4 & 0 \\ 0 & 0 & 0 & 0 & 1 & 2 & 0 & -1 & 2 & 1 & 1 & 2 & 8 \\ 0 & 0 & 0 & 0 & 1 & -1 & 1 & 2 & -2 & 0 & -2 & 2 & 4 \\ 0 & 0 & 0 & 0 & 0 & 0 & 2 & 1 & 1 & 1 & 1 & 0 & 4 \\ 0 & 0 & 0 & 0 & 0 & 0 & 0 & 0 & 0 & 2 & 1 & 3 & 0\end{pmatrix}\notag\end{equation}$$