The model contains four varying parameters called S1, S2, S3 and S4 and two constant parameters called k1 and k2. (Note that indeed S1, S2, S3 and S4 are parameters and not species in this model.)

The model contains four rules:

Type Variable Formula
Rate S1 k2 · S3 · S4−k1 · S1 · S2
Rate S2 k2 · S3 · S4−k1 · S1 · S2
Rate S3 k1 · S1 · S2−k2 · S3 · S4
Rate S4 k1 · S1 · S2−k2 · S3 · S4

The initial conditions are as follows:

Value Units
Value of parameter S1 1.0 × 10−2 any
Value of parameter S2 1.0 × 10−2 same as S1
Value of parameter S3 2.0 × 10−2 same as S1
Value of parameter S4 1.0 × 10−2 same as S1
Value of parameter k1 0.75 × 102 (units of S1)-1 second-1
Value of parameter k2 0.25 × 102 (units of S1)-1 second-1