[ Eq(Derivative(x1, t), (-(k1*x5 + k9*x7))*x1),
  Eq(Derivative(x2, t), (-k2)*(1 + k10)*x4*x2),
  Eq(Derivative(x3, t), (-k4)*x6*x3),
  Eq(Derivative(x4, t), (k1*x5 + k9*x7)*x1 - k5*x4),
  Eq(Derivative(x5, t), k2*x4*x2 - k3*x7*x5 - k6*x5),
  Eq(Derivative(x6, t), k2*k10*x4*x2 + k3*x7*x5 - k7*x6),
  Eq(Derivative(x7, t), k4*x6*x3 - k8*x7) ]