{ diff(x1, t) = ((-1)*k47*k40*x1*x2 + (-1)*k47*k38*x10 + 1*k47*k27*x3)/k47,
  diff(x2, t) = ((-1)*k47*k40*x1*x2 + (-1)*k47*k19*x2*k46*k4*piecewise(1 - exp((-(t - k6))/k8), and(t >= k6, t <= k10), piecewise(exp((-(t - k10))/k8), t > k10, 0)) + 1*k47*k33*x17 + 1*k47*k27*x3)/k47,
  diff(x3, t) = (1*k47*k40*x1*x2 + (-1)*k47*k41*x3*x4*k45*piecewise(k3*(1 - exp((-(t - k5))/k7)), and(t >= k5, t <= k9), piecewise(k3*exp((-(t - k5))/k7), t >= k9, 0)) + (-1)*k47*k27*x3)/k47,
  diff(x4, t) = ((-1)*k47*k41*x3*x4*k45*piecewise(k3*(1 - exp((-(t - k5))/k7)), and(t >= k5, t <= k9), piecewise(k3*exp((-(t - k5))/k7), t >= k9, 0)) + 1*k47*k38*x10)/k47,
  diff(x5, t) = (1*k47*k41*x3*x4*k45*piecewise(k3*(1 - exp((-(t - k5))/k7)), and(t >= k5, t <= k9), piecewise(k3*exp((-(t - k5))/k7), t >= k9, 0)) + (-1)*k47*k11*x5*x6 + (-1)*k47*k15*x5*x13)/k47,
  diff(x6, t) = ((-1)*k47*k11*x5*x6 + (-1)*k47*k14*x6*x10 + 1*k47*k36*x9)/k47,
  diff(x7, t) = (1*k47*k11*x5*x6 + (-1)*k47*k12*x7)/k47,
  diff(x8, t) = (1*k47*k12*x7 + (-1)*k47*k13*x8 + 1*k47*k14*x6*x10)/k47,
  diff(x9, t) = (1*k47*k13*x8 + (-1)*k47*k36*x9)/k47,
  diff(x10, t) = (1*k47*k13*x8 + (-1)*k47*k14*x6*x10 + (-1)*k47*k38*x10 + 1*k47*k17*x15 + (-1)*k47*k18*x10*x13)/k47,
  diff(x11, t) = (1*k47*k38*x10 + (-1)*k47*k32*x11)/k47,
  diff(x12, t) = 0,
  diff(x13, t) = ((-1)*k47*k15*x5*x13 + (-1)*k47*k18*x10*x13 + (-1)*k47*(k34*x13*x17 + k37*x13*x11) + 1*k47*(k35*x16 + k43*x16*x9) + 2*k47*k20*x18 + (-2)*k47*k39*x13*x19 + 1*k47*k23*x23 + (-1)*k47*k24*x13*x24)/k47,
  diff(x14, t) = (1*k47*k15*x5*x13 + (-1)*k47*k16*x14)/k47,
  diff(x15, t) = (1*k47*k16*x14 + (-1)*k47*k17*x15 + 1*k47*k18*x10*x13)/k47,
  diff(x16, t) = (1*k47*k17*x15 + 1*k47*(k34*x13*x17 + k37*x13*x11) + (-1)*k47*(k35*x16 + k43*x16*x9))/k47,
  diff(x17, t) = (1*k47*k19*x2*k46*k4*piecewise(1 - exp((-(t - k6))/k8), and(t >= k6, t <= k10), piecewise(exp((-(t - k10))/k8), t > k10, 0)) + (-1)*k47*k33*x17)/k47,
  diff(x18, t) = ((-1)*k47*k20*x18 + 1*k47*k39*x13*x19)/k47,
  diff(x19, t) = (1*k47*k20*x18 + (-1)*k47*k39*x13*x19 + (-1)*k47*(k21*x19*x9 + k44*x19*x16) + 1*k47*k28*x20)/k47,
  diff(x20, t) = (1*k47*(k21*x19*x9 + k44*x19*x16) + (-1)*k47*k28*x20)/k47,
  diff(x21, t) = 0,
  diff(x22, t) = (1*k47*k22*x20 + (-1)*k47*k29*x22)/k47,
  diff(x23, t) = ((-1)*k47*k23*x23 + 1*k47*k24*x13*x24)/k47,
  diff(x24, t) = (1*k47*k23*x23 + (-1)*k47*k24*x13*x24 + (-1)*k47*k25*x24*x16 + (-1)*k47*k42*x24*x9 + 1*k47*k30*x25)/k47,
  diff(x25, t) = (1*k47*k25*x24*x16 + (-1)*k47*k30*x25)/k47,
  diff(x26, t) = (1*k47*k26*x25 + (-1)*k47*k31*x26)/k47 }