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

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

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

Type Variable Formula
Rate k1 0.2

The initial conditions are as follows:

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 1.7 litre mole-1 second-1
Value of parameter k2 0.3 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.