The model contains one varying compartment called C. There are three species called S1, S2 and S3 and four parameters called k1, k2, p1 and p2. The model contains two reactions defined as:

Reaction Rate
S1 + S2 → S3 k1 · S1 · S2 · C
S3 → S1 + S2 k2 · S3 · C

The model contains two rules. The assignmentRule assigns value to C and the rateRule determines the rate at which p2 is varying:

Type Variable Formula
Assignment C p1 · p2
Rate p2 0.1 |] In this case, the initial value declared for compartment C is inconsistent with that 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: [‎width:30em,margin−left:5em‏| |·Value· |·Units· | |Initial amount of S1 | 1.0 |mole | |Initial amount of S2 | 2.0 |mole | |Initial amount of S3 | 1.0 |mole | |Value of parameter k1 | 0.75 |litre mole−1^ second−1^ | |Value of parameter k2 | 2.5 |second−1^ | |Value of parameter p1 | 0.1 |litre mole−1^ | |Value of parameter p2 | 1.0 |mole 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.