[ Eq(Derivative(x1, t), ((-1)*(k18*x1*x15 + (-k19*x16))*k13 + 1*x3*k3*x19*1/(k21 + x19)*k13 + 1*x3*k7*x5*1/(k37 + x5)*k13 + (-1)*(k44*x26*x1 + (-k45*x2))*k13 + (-1)*k57*(x1 + (-x11))*k16)/k13),
  Eq(Derivative(x2, t), (1*(k44*x26*x1 + (-k45*x2))*k13 + (-1)*(k48*x4*x2 + (-k49*x5))*k13 + (-1)*k51*(x2 + (-x13))*k16)/k13),
  Eq(Derivative(x3, t), 0/k13),
  Eq(Derivative(x4, t), (1*x3*k3*x19*1/(k21 + x19)*k13 + (-1)*(k26*x16*x4 + (-k27*x19))*k13 + 1*x3*k7*x5*1/(k37 + x5)*k13 + (-1)*(k48*x4*x2 + (-k49*x5))*k13)/k13),
  Eq(Derivative(x5, t), ((-1)*x3*k7*x5*1/(k37 + x5)*k13 + 1*(k48*x4*x2 + (-k49*x5))*k13)/k13),
  Eq(Derivative(x6, t), (1*(k28*x22 + (-k29*x6*x21))*k15 + 4*1/4*k40*x8*x10*1/(k41 + x7 + x10)*k15 + 1*(k42*x10 + (-k43*x7*x6))*k15 + 4*1/4*k46*x8*x22*1/(k47 + x7 + x22)*k15 + 1*k53*(x24 + (-x6))*k16)/k15),
  Eq(Derivative(x7, t), ((-1)*3/4*k38*x8*x7*1/(k39 + x7 + x10)*k15 + 1*1/4*k40*x8*x10*1/(k41 + x7 + x10)*k15 + 1*(k42*x10 + (-k43*x7*x6))*k15 + 1*k67*(x12 + (-x7))*k16)/k15),
  Eq(Derivative(x8, t), 0/k15),
  Eq(Derivative(x9, t), ((-1)*(k33*x9*x11 + (-k34*x13))*k15 + 1*3/4*k38*x8*x7*1/(k39 + x7 + x10)*k15 + 3*1/4*k40*x8*x10*1/(k41 + x7 + x10)*k15 + 1*k69*(x26 + (-x9))*k16)/k15),
  Eq(Derivative(x10, t), ((-4)*1/4*k40*x8*x10*1/(k41 + x7 + x10)*k15 + (-1)*(k42*x10 + (-k43*x7*x6))*k15 + 1*k55*(x14 + (-x10))*k16)/k15),
  Eq(Derivative(x11, t), ((-1)*(k22*x11*x23 + (-k23*x20))*k15 + (-1)*(k33*x9*x11 + (-k34*x13))*k15 + 1*k57*(x1 + (-x11))*k16)/k15),
  Eq(Derivative(x12, t), (1*k5*x3*x26*1/(k32 + x26)*k13 + (-1)*(k35*x12*x24 + (-k36*x14))*k13 + 1*x3*k7*x5*1/(k37 + x5)*k13 + (-1)*k67*(x12 + (-x7))*k16)/k13),
  Eq(Derivative(x13, t), (1*(k33*x9*x11 + (-k34*x13))*k15 + 1*k51*(x2 + (-x13))*k16)/k15),
  Eq(Derivative(x14, t), (1*(k35*x12*x24 + (-k36*x14))*k13 + (-1)*k55*(x14 + (-x10))*k16)/k13),
  Eq(Derivative(x15, t), ((-1)*(k18*x1*x15 + (-k19*x16))*k13 + (-1)*k1*x3*x15*1/(k20 + x15)*k13 + (-1)*k65*(x15 + (-x23))*k16)/k13),
  Eq(Derivative(x16, t), (1*(k18*x1*x15 + (-k19*x16))*k13 + (-1)*(k26*x16*x4 + (-k27*x19))*k13 + (-1)*k61*(x16 + (-x20))*k16)/k13),
  Eq(Derivative(x17, t), (1*k1*x3*x15*1/(k20 + x15)*k13 + 1*x3*k3*x19*1/(k21 + x19)*k13 + (-1)*(k24*x24*x17 + (-k25*x18))*k13 + 1*Piecewise((k9*16611295681/10000000000000*x25, And(Gt(t, k10), Lt(t, k10 + k11))), (0, True))*k13*1 + (-1)*k59*(x17 + (-x21))*k16)/k13),
  Eq(Derivative(x18, t), (1*(k24*x24*x17 + (-k25*x18))*k13 + (-1)*k63*(x18 + (-x22))*k16)/k13),
  Eq(Derivative(x19, t), ((-1)*x3*k3*x19*1/(k21 + x19)*k13 + 1*(k26*x16*x4 + (-k27*x19))*k13)/k13),
  Eq(Derivative(x20, t), (1*(k22*x11*x23 + (-k23*x20))*k15 + 1*k61*(x16 + (-x20))*k16)/k15),
  Eq(Derivative(x21, t), (1*(k28*x22 + (-k29*x6*x21))*k15 + (-1)*3/4*k30*x8*x21*1/(k31 + x21 + x10)*k15 + 1*1/4*k46*x8*x22*1/(k47 + x7 + x22)*k15 + 1*k59*(x17 + (-x21))*k16)/k15),
  Eq(Derivative(x22, t), ((-1)*(k28*x22 + (-k29*x6*x21))*k15 + (-4)*1/4*k46*x8*x22*1/(k47 + x7 + x22)*k15 + 1*k63*(x18 + (-x22))*k16)/k15),
  Eq(Derivative(x23, t), ((-1)*(k22*x11*x23 + (-k23*x20))*k15 + 1*3/4*k30*x8*x21*1/(k31 + x21 + x10)*k15 + 3*1/4*k46*x8*x22*1/(k47 + x7 + x22)*k15 + 1*k65*(x15 + (-x23))*k16)/k15),
  Eq(Derivative(x24, t), ((-1)*(k24*x24*x17 + (-k25*x18))*k13 + (-1)*(k35*x12*x24 + (-k36*x14))*k13 + (-1)*k53*(x24 + (-x6))*k16)/k13),
  Eq(Derivative(x25, t), 0/k13),
  Eq(Derivative(x26, t), ((-1)*k5*x3*x26*1/(k32 + x26)*k13 + (-1)*(k44*x26*x1 + (-k45*x2))*k13 + (-1)*k69*(x26 + (-x9))*k16)/k13) ]