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

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

The reaction applies the functionDefinition defined as:

Id Arguments Formula
multiply x, y x · y

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 mole
Value of parameter kf 1.1 litre mole-1 second-1
Value of parameter kr 0.11 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.