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 (kf · S1 − kr · S2 · S3) · C

The model contains one rule which assigns value to parameter kf:

Type Variable Formula
Assignment kf 2.5

In this case there is no initial value declared for parameter k1. Thus the value must be calculated using the assignmentRule.

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 undeclared second-1
Value of parameter kr 0.2 litre mole-1 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.