{ diff(x36, t) = 0/k68,
  diff(x37, t) = 0/k68,
  diff(x38, t) = 0/k68,
  diff(x39, t) = 0/k68,
  diff(x40, t) = 0/k68,
  diff(x41, t) = 0/k68,
  diff(x42, t) = 0/k68,
  diff(x43, t) = 0/k68,
  diff(x1, t) = k1*x4*x3 - k2*x25 + k3*x2*x32 + k4*x2*x30 - k42*x25*x22 - k43*x26*x21,
  diff(x2, t) = k1*x5*x3 - k2*x2 - k3*x2*x32 - k4*x2*x30,
  diff(x3, t) = (-(k1*x4*x3 - k2*x25)) - (k1*x5*x3 - k2*x2),
  diff(x4, t) = (-(k1*x4*x3 - k2*x25)) + k3*x5*x32,
  diff(x5, t) = (-(k1*x5*x3 - k2*x2)) - k3*x5*x32,
  diff(x6, t) = k5/k6*x7*x25 + k7*x7*x18/(k8 + x7) - k44*x22*x6,
  diff(x7, t) = (-k5/k6)*x7*x25 - k7*x7*x18/(k8 + x7),
  diff(x8, t) = k9/k10*x9*x25 + k11*x27*x31/(x43*k12) + k13*x27*x28*x31/(x43^2*k15*k13) - (k17*x30*x21 - k18*x22) - (k45*x20 + k46*x36 + k47*x37 + k48*x40)*x30 - k49*x20*x29,
  diff(x9, t) = (-k9/k10)*x9*x25 - k11*x27*x31/(x43*k12) - k13*x27*x28*x31/(x43^2*k15*k13),
  diff(x10, t) = k19*x43*x30*x11 + k20*x29*x33/x43 - (k50*x20 + k51*x36 + k52*x37 + k53*x40 + k54*x39)*x32,
  diff(x11, t) = (-k19)*x43*x30*x11 - k20*x29*x33/x43,
  diff(x12, t) = k21/k22*x13*x32,
  diff(x13, t) = (-k21/k22)*x13*x32,
  diff(x14, t) = k23*x15*x32/(k24 + x32) - k55*x14,
  diff(x15, t) = (-k23)*x15*x32/(k24 + x32),
  diff(x16, t) = k25*x17*x32/(k26 + x32) - k56*x23*x35,
  diff(x17, t) = (-k25)*x17*x32/(k26 + x32),
  diff(x18, t) = k27*x43*x19*x32 - (k57*x20 + k58*x38 + k59*x37 + k60*x40 + k61*x41)*x18,
  diff(x19, t) = (-k27)*x43*x19*x32,
  diff(x20, t) = (-(k44*x6 + k45*x30 + k49*x29 + k50*x32 + k57*x18))*x20,
  diff(x21, t) = (-(k17*x30*x21 - k18*x22)) - k43*x26*x21,
  diff(x22, t) = k17*x30*x21 - k18*x22 - k42*x25*x22,
  diff(x23, t) = k28*x24*x32 - (k62*x36 + k63*x38 + k64*x37 + k65*x40)*x23,
  diff(x24, t) = (-k28)*x24*x32 }