[ Eq(Derivative(x1, t), (1*k23*k3*x1*Piecewise((1 - (x7 + x2 + x1 + x4 + x3 + x5)/k22, Gt(1 - (x7 + x2 + x1 + x4 + x3 + x5)/k22, 0)), (0, True)) + (-1)*k23*k13*x7*x1*(1 + k14*x4)*x6**2/(x6**2 + k16**2))/k23),
  Eq(Derivative(x2, t), (1*k23*2**k1*k13*x7*x1*x6**2/(x6**2 + k16**2)*(1 + k14*x4) + (-1)*k23*k8*x2)/k23),
  Eq(Derivative(x3, t), (1*k23*k4*x3*Piecewise((1 - (x7 + x2 + x1 + x4 + x3 + x5)/k22, Gt(1 - (x7 + x2 + x1 + x4 + x3 + x5)/k22, 0)), (0, True)) + (-1)*k23*k15*x7*x3*x6**2/(x6**2 + k16**2))/k23),
  Eq(Derivative(x4, t), (1*k23*2**k1*k15*x7*x3*x6**2/(x6**2 + k16**2) + (-1)*k23*k9*x4)/k23),
  Eq(Derivative(x5, t), (1*k23*k12 + 1*k23*k5*x5*Piecewise((1 - (x7 + x2 + x1 + x4 + x3 + x5)/k22, Gt(1 - (x7 + x2 + x1 + x4 + x3 + x5)/k22, 0)), (0, True)) + (-1)*k23*k10*x5)/k23),
  Eq(Derivative(x6, t), (1*k23*k11*x7*(x2 + x4) + (-1)*k23*k7*x6 + (-1)*k23*x8 + 1*k23*k21)/k23),
  Eq(Derivative(x7, t), (1*k23*k2*x7*(1 - x7/k18) + (-1)*k23*k6*x7*x2)/k23),
  Eq(Derivative(x8, t), 0/k23) ]