[ Eq(Derivative(x1, t), 1*k26*k1*x3**k11*(1 - x1/k8)/k26),
  Eq(Derivative(x2, t), (1*k26*k2*x1**k12*(1 - x1/k8)*k13 + 1*k26*k3*x2**k14*(1 - x1/k8) + (-1)*k26*k4*x2**k19*x4**k20 + (-1)*k26*k5*x2)/k26),
  Eq(Derivative(x3, t), ((-1)*k26*k1*x3**k11*(1 - x1/k8) + 1*k26*k4*x2**k19*x4**k20 + (-1)*k26*k6*x3**k21)/k26),
  Eq(Derivative(x4, t), (1*k26*k7*x1**k15*x2**k16*(k23 + x3)**k17*(1 - x1/k8)**k18 + (-1)*k26*k24*x4**k22)/k26),
  Eq(Derivative(x5, t), ((-1)*k26*k9*x4 + 1*k26*k10*x3)/k26) ]