The model contains two compartments named compartment and compartment1. There are three species named S1, S3 and S5 and three parameters named k1, k2 and k4. Compartment "compartment" contains species S1. Compartment "compartment"1 contains species S3 and S5. The model contains two reactions defined as:

Reaction Rate
S1 → S3 k1 · S1 · compartment
S3 → S1 k2 · (S3−S1) · compartment1

Both reactions occur between species within different compartments.

The model contains one rule which assigns value to species S5:

Type Variable Formula
Assignment S5 k4 · S3

In this case the initial value declared for species S5 is consistent with that calculated by the assignmentRule. Note that since this assignmentRule must always remain true, it should be considered during simulation.

The initial conditions are as follows:

Value Units
Initial amount of S1 1.0 mole
Initial amount of S3 0 mole
Initial amount of S5 0 mole
Value of parameter k1 0.75 second-1
Value of parameter k2 0.25 second-1
Value of parameter k4 0.5 dimensionless
Volume of compartment "compartment" 1 litre
Volume of compartment "compartment"1 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.