The model contains one compartment called C. There are four species named S1, S2, S3 and S4 and three parameters named k1, k2 and k3. The model contains three reactions defined as:

Reaction Rate
S1 → S2 k1 · S1 · C · time
2S2 → S3 k2 · S2 · C · time
S3 → S4 k3 · S3 · C · time

where the symbol 'time' denotes the current simulation time.

The initial conditions are as follows:

Value Units
Initial amount of S1 1.0 × 10−2 mole
Initial amount of S2 0 mole
Initial amount of S3 0 mole
Initial amount of S4 0 mole
Value of parameter k1 0.7 second-2
Value of parameter k2 0.5 second-2
Value of parameter k3 1 second-2
Volume of compartment C 1 litre

The species values are given as amounts of substance to make it easier to use the model in a discrete stochastic simulator, but (as per usual SBML principles) their symbols represent their values in concentration units where they appear in expressions.