-8/(k1.k1+2*k1.k2+k2.k2)/(k1.k1+2*k1.k2+k2.k2)*k1.k3*k2.k4*GS^4+8/(
      k1.k1+2*k1.k2+k2.k2)/(k1.k1+2*k1.k2+k2.k2)*k1.k3*k2.k4*GS^4*NF^2-
      8/(k1.k1+2*k1.k2+k2.k2)/(k1.k1+2*k1.k2+k2.k2)*k1.k4*k2.k3*GS^4+8
      /(k1.k1+2*k1.k2+k2.k2)/(k1.k1+2*k1.k2+k2.k2)*k1.k4*k2.k3*GS^4*
      NF^2-8/(k1.k1+2*k1.k2+k2.k2)/(k1.k1+2*k1.k2+k2.k2)*k3.k4*GS^4*
      MT^2+8/(k1.k1+2*k1.k2+k2.k2)/(k1.k1+2*k1.k2+k2.k2)*k3.k4*GS^4*
      MT^2*NF^2;