The model contains one compartment called C. There are five species called S1, S2, S3, S4 and S5 and two parameters called k1 and k2. Species S5 is labeled as constant and therefore cannot be changed by rules or reactions. The model contains two reactions defined as:

Reaction Rate
S1 + S2 → S3 + S4 k1 · S1 · S2 · C
S3 + S4 → S1 + S2 k2 · S3 · S4 · C / S5

The initial conditions are as follows:

Value Units
Initial concentration of S1 1.0 × 10−6 mole litre-1
Initial concentration of S2 1.5 × 10−6 mole litre-1
Initial concentration of S3 2.0 × 10−6 mole litre-1
Initial concentration of S4 0.5 × 10−6 mole litre-1
Initial concentration of S5 1.0 × 10−6 mole litre-1
Value of parameter k1 1.3 × 106 litre mole-1 second-1
Value of parameter k2 0.3 litre mole-1 second-1
Volume of compartment C 1 litre