Matrix t*K(1) in Subspace 87 with Dimension 4

(K(1) is the first-order Grosse operator)

(-I)*Sqrt[3]*t ((3 - I*Sqrt[3])*U)/2 I*Sqrt[6]*U (I*(3*I + Sqrt[3])*t)/Sqrt[2]
(-I/2)*(-3*I + Sqrt[3])*U (-I)*Sqrt[3]*t ((3 + I*Sqrt[3])*t)/Sqrt[2] 0
I*Sqrt[6]*U (I*(3*I + Sqrt[3])*t)/Sqrt[2] 0 0
((3 + I*Sqrt[3])*t)/Sqrt[2] 0 0 0