The model contains one compartment called C. There are three species called S1, S2 and S3 and two parameters called kf and kr. Species S3 is labeled as an SBML boundary species. The model contains one reaction defined as:

Reaction Rate
S1 + S2 ↔ S3 (kf · S1 · S2 − kr · S3) · C

The initial conditions are as follows:

Value Units
Initial amount of S1 1.0 mole
Initial amount of S2 0.5 mole
Initial amount of S3 0.4 mole
Value of parameter kf 1.1 litre mole-1 second-1
Value of parameter kr 0.09 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.