The model contains one compartment called "compartment". There are four species called S1, S2, S3 and S4; one constant parameter called k2 and one varying parameter called k2. The model contains two reactions defined as:

Reaction Rate
S1 + S2 → S3 + S4 k1 · S1 · S2 · compartment
S3 + S4 → S1 + S2 k2 · S3 · S4 · compartment

The model contains one rule which defines that rate at which parameter k1 varies:

Type Variable Formula
Rate k1 106

The initial conditions are as follows:

Value Units
Initial amount of S1 1.0 × 10−6 mole
Initial amount of S2 1.5 × 10−6 mole
Initial amount of S3 2.0 × 10−6 mole
Initial amount of S4 0.5 × 10−6 mole
Value of parameter k1 1 × 106 litre mole-1 second-1
Value of parameter k2 0.3 × 106 litre mole-1 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.