The model contains one compartment called C. There are three species called S1, S2 and S and two parameters called k1 and k2. The model contains one reaction defined as:

Reaction Rate
S1 → S2 C · k2 · S1

The model contains one rule which assigns value to species S3:

Type Variable Formula
Assignment S3 k1 · S2 · t

where the symbol 't' denotes the current simulation time.

In this case the initial value for species S3 is inconsistent with the value calculated by the assignmentRule; the calculated value should be used. Note that since this assignmentRule must always remain true, it should be considered during simulation.

The initial conditions are as follows:

Value Units
Initial amount of S1 1 mole
Initial amount of S2 1.5 × 10−15 mole
Initial amount of S3 1 mole
Value of parameter k1 0.75 second-1
Value of parameter k2 2.5 second-1
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.