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

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

The value of k2 is zero, which means the reverse reaction should occur at zero rate (i.e. not at all).

The initial conditions are as follows:

Value Units
Initial amount of S1 1.0 × 10−4 mole
Initial amount of S2 1.1 × 10−4 mole
Initial amount of S3 1.0 × 10−4 mole
Value of parameter k1 0.75 × 104 litre mole-1 second-1
Value of parameter k2 0 second-1
Volume of compartment "compartment" 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.

Note: The test data for this model was generated from an analytical solution of the system of equations.