[ Eq(Derivative(x22, t), 0/k30),
  Eq(Derivative(x1, t), 1/(1 + k13)*(k8/(171/1000)*(k13*x20**2 + x15**2) - k8*(k13*x13 + x11))),
  Eq(Derivative(x2, t), 1/(k13 + 1)*(k8/(171/1000)*(k13*x18*x20 + x15*x21) - k8*(k13*x17 + x16))),
  Eq(Derivative(x3, t), 1/(1 + k13)*(k13*k6*x26*k17/(k17 + x22)*x6 - k7*x15)),
  Eq(Derivative(x4, t), k1*(k27 + k26*x16 - (k18*x9 + k25)*x4)),
  Eq(Derivative(x5, t), k1*((1 - k5)*(1 - k16) - (k4 + 1 - k28)*x5)),
  Eq(Derivative(x6, t), k2*x10 - (k3 + k6*x26*k17/(k17 + x22))*x6),
  Eq(Derivative(x7, t), k1*(k4*x5 - (1 - k28)*x25 - k18*x4*x9)),
  Eq(Derivative(x8, t), k6*x26*k17/(k17 + x22)*x6 + k2*x15 - k3*(x20 + k11*(x17 + 2*x13))),
  Eq(Derivative(x13, t), k8/(171/1000)*x20**2 - (k8 + k3*k11)*x13),
  Eq(Derivative(x17, t), k8/(171/1000)*x18*x20 - (k8 + k3*k11)*x17),
  Eq(Derivative(x19, t), k3*x21 - k3*(x18 + k11*x17)),
  Eq(Derivative(x24, t), k1*(k18*x4*x9 - (k22 + k12*(1 - k28))*x24)),
  Eq(Derivative(x26, t), k1*(k22*x24 - k12*(1 - k28)*x26)) ]