The model contains one compartment called "compartment". There are three species named S1, S2 and S3 and two parameters named k1 and k2. Compartment "compartment" is 2-dimensional. Species S3 is labeled as an SBML boundary species. The model contains two reactions defined as:

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

The initial conditions are as follows:

Value Units
Initial amount of S1 1.0 × 10−2 mole
Initial amount of S2 2.0 × 10−2 mole
Initial amount of S3 1.0 × 10−2 mole
Value of parameter k1 0.75 metre2 mole-1 second-1
Value of parameter k2 0.25 second-1
Area of compartment "compartment" 1 metre2

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.