begin name
deback1
end name

begin reactions
reaction1 {1.0}$EXTERNAL = {1.0}species1
reaction2 {1.0}species1 = {1.0}$EXTERNAL
reaction3 {1.0}$EXTERNAL = {1.0}species2
reaction4 {1.0}species2 = {1.0}$EXTERNAL
reaction5 {1.0}$EXTERNAL = {1.0}species3
reaction6 {1.0}species3 = {1.0}$EXTERNAL
reaction7 {1.0}$EXTERNAL = {1.0}species4
reaction8 {1.0}species4 = {1.0}$EXTERNAL
end reactions

begin rate equations
reaction1 = compartment1*function1[reaction1theta, reaction1a, species3[t], reaction1n]
reaction2 = compartment1*reaction2k1*species1[t]
reaction3 = compartment1*function2[reaction3theta, reaction3b, species2[t], species4[t], reaction3n, reaction3c, species1[t]]
reaction4 = compartment1*reaction4k1*species2[t]
reaction5 = compartment1*function1[reaction5theta, reaction5a, species1[t], reaction5n]
reaction6 = compartment1*reaction6k1*species3[t]
reaction7 = compartment1*function2[reaction7theta, reaction7b, species2[t], species4[t], reaction7n, reaction7c, species3[t]]
reaction8 = compartment1*reaction8k1*species4[t]
end rate equations

begin parameters
reaction1theta = 0.0001
reaction1a = 1.0
reaction1n = 4.0
reaction2k1 = 1.0
reaction3theta = 0.0001
reaction3b = 21.0
reaction3n = 4.0
reaction3c = 1.0
reaction4k1 = 1.0
reaction5theta = 0.0001
reaction5a = 1.0
reaction5n = 4.0
reaction6k1 = 1.0
reaction7theta = 0.0001
reaction7b = 21.0
reaction7n = 4.0
reaction7c = 1.0
reaction8k1 = 1.0
compartment1 = 1.0
end parameters

begin initial conditions
species1[0] = species1i
species2[0] = species2i
species3[0] = species3i
species4[0] = species4i
end initial conditions

begin initial values
species1i = 0.0
species2i = 0.0
species3i = 0.0
species4i = 0.0
end initial values

begin assignment rules
end assignment rules

begin function definitions
function1[theta_,a_,Xj_,n_] := theta/(theta + a*Xj^n)
function2[theta_,b_,Yi_,Yj_,n_,c_,Xi_] := (theta + b*(Yi*Yj)^n)/(theta + c*Xi^n + b*(Yi*Yj)^n)
end function definitions

begin events
end events

begin process annotations
end process annotations

begin species annotations
end species annotations

begin units
end units