Matrix t*K(1) in Subspace 86 with Dimension 12

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

(-I/2)*Sqrt[3]*t (I/2)*Sqrt[3]*U 0 0 0 0 -((3*I + Sqrt[3])*t)/(2*Sqrt[2]) 0 0 (-3*(-I + Sqrt[3])*t)/(2*Sqrt[2]) ((3*I)/2)*U -(Sqrt[3]*t)/2
(I/2)*Sqrt[3]*U (-I/2)*Sqrt[3]*t 0 0 0 -(Sqrt[3/2]*t) 0 ((-3*I + Sqrt[3])*t)/(2*Sqrt[2]) Sqrt[3/2]*t 0 ((3*I)/2)*t -(Sqrt[3]*U)/2
0 0 0 0 0 ((1 - I*Sqrt[3])*t)/Sqrt[2] 0 -(Sqrt[2]*t) Sqrt[2]*t 0 0 0
0 0 0 0 0 Sqrt[2]*U ((1 + I*Sqrt[3])*t)/Sqrt[2] 0 0 0 0 -2*t
0 0 0 0 I*Sqrt[3]*t (U - I*Sqrt[3]*U)/2 0 0 0 0 0 0
0 Sqrt[3/2]*t ((-1 - I*Sqrt[3])*t)/Sqrt[2] -(Sqrt[2]*U) (-U - I*Sqrt[3]*U)/2 0 0 (I/2)*(I + Sqrt[3])*t t 0 -(t/Sqrt[2]) 0
((-3*I + Sqrt[3])*t)/(2*Sqrt[2]) 0 0 (I*(I + Sqrt[3])*t)/Sqrt[2] 0 0 0 (U - I*Sqrt[3]*U)/2 (U + I*Sqrt[3]*U)/2 -t 0 ((3 + I*Sqrt[3])*t)/(2*Sqrt[2])
0 -((3*I + Sqrt[3])*t)/(2*Sqrt[2]) Sqrt[2]*t 0 0 ((1 + I*Sqrt[3])*t)/2 (-U - I*Sqrt[3]*U)/2 0 ((1 + I*Sqrt[3])*t)/2 (U - I*Sqrt[3]*U)/2 ((Sqrt[2] + I*Sqrt[6])*t)/4 0
0 -(Sqrt[3/2]*t) -(Sqrt[2]*t) 0 0 -t (I/2)*(I + Sqrt[3])*U (I/2)*(I + Sqrt[3])*t 0 (-U - I*Sqrt[3]*U)/2 t/Sqrt[2] 0
(3*(I + Sqrt[3])*t)/(2*Sqrt[2]) 0 0 0 0 0 t (-U - I*Sqrt[3]*U)/2 (U - I*Sqrt[3]*U)/2 0 0 ((Sqrt[2] - I*Sqrt[6])*t)/4
((3*I)/2)*U ((3*I)/2)*t 0 0 0 t/Sqrt[2] 0 ((I/2)*(I + Sqrt[3])*t)/Sqrt[2] -(t/Sqrt[2]) 0 (I/2)*Sqrt[3]*t U/2
(Sqrt[3]*t)/2 (Sqrt[3]*U)/2 0 2*t 0 0 ((I/2)*(3*I + Sqrt[3])*t)/Sqrt[2] 0 0 ((-I/2)*(-I + Sqrt[3])*t)/Sqrt[2] -U/2 (-I/2)*Sqrt[3]*t