[ Eq(Derivative(x1, t), (-1)*k2*k3*x2*x1/k2),
  Eq(Derivative(x2, t), (-1)*k2*k3*x2*x1/k2),
  Eq(Derivative(x3, t), (1*k2*k3*x2*x1 + (-1)*k2*k7*x3*x4 + 1*k2*k8*x9)/k2),
  Eq(Derivative(x4, t), (1*k2*k4*x5**2 + (-1)*k2*k5*x4 + (-1)*k2*k7*x3*x4 + 1*k2*k8*x9 + 1*k2*k12*x11)/k2),
  Eq(Derivative(x5, t), ((-2)*k2*k4*x5**2 + 2*k2*k5*x4)/k2),
  Eq(Derivative(x6, t), ((-1)*k2*k6*x6*x8 + 1*k2*k11*x10)/k2),
  Eq(Derivative(x7, t), (1*k2*k6*x6*x8 + (-1)*k2*k9*x7*x9 + 1*k2*k10*x10)/k2),
  Eq(Derivative(x8, t), ((-1)*k2*k6*x6*x8 + (-1)*k2*k13*x8*x18 + 1*k2*k25*x12 + 2*k2*k26*x19 + 3*k2*k27*x22)/k2),
  Eq(Derivative(x9, t), (1*k2*k7*x3*x4 + (-1)*k2*k8*x9 + (-1)*k2*k9*x7*x9 + 1*k2*k10*x10)/k2),
  Eq(Derivative(x10, t), (1*k2*k9*x7*x9 + (-1)*k2*k10*x10 + (-1)*k2*k11*x10)/k2),
  Eq(Derivative(x11, t), (1*k2*k11*x10 + (-1)*k2*k12*x11)/k2),
  Eq(Derivative(x12, t), (1*k2*k12*x11 + (-1)*k2*k14*x12*x13 + 1*k2*k15*x14 + (-1)*k2*k25*x12)/k2),
  Eq(Derivative(x13, t), ((-1)*k2*k14*x12*x13 + 1*k2*k15*x14 + 1*k2*k19*x17 + (-1)*k2*k20*x13*x19 + 1*k2*k24*x21)/k2),
  Eq(Derivative(x14, t), (1*k2*k14*x12*x13 + (-1)*k2*k15*x14 + (-1)*k2*k16*x14*x15 + 1*k2*k17*x16)/k2),
  Eq(Derivative(x15, t), (1*k2*k13*x8*x18 + (-1)*k2*k16*x14*x15 + 1*k2*k17*x16 + (-1)*k2*k21*x15*x17 + 1*k2*k22*x20)/k2),
  Eq(Derivative(x16, t), (1*k2*k16*x14*x15 + (-1)*k2*k17*x16 + (-1)*k2*k18*x16)/k2),
  Eq(Derivative(x17, t), (1*k2*k18*x16 + (-1)*k2*k19*x17 + 1*k2*k20*x13*x19 + (-1)*k2*k21*x15*x17 + 1*k2*k22*x20)/k2),
  Eq(Derivative(x18, t), ((-1)*k2*k13*x8*x18 + 1*k2*k18*x16 + 1*k2*k23*x20)/k2),
  Eq(Derivative(x19, t), (1*k2*k19*x17 + (-1)*k2*k20*x13*x19 + (-1)*k2*k26*x19)/k2),
  Eq(Derivative(x20, t), (1*k2*k21*x15*x17 + (-1)*k2*k22*x20 + (-1)*k2*k23*x20)/k2),
  Eq(Derivative(x21, t), (1*k2*k23*x20 + (-1)*k2*k24*x21)/k2),
  Eq(Derivative(x22, t), (1*k2*k24*x21 + (-1)*k2*k27*x22)/k2),
  Eq(Derivative(x23, t), (1*k2*k25*x12 + 1*k2*k26*x19 + 1*k2*k27*x22)/k2) ]