The model contains one compartment called "compartment". There are two species named S1 and S2 and two parameters named k1 and k2. Compartment "compartment" is 2-dimensional. The model contains two reactions defined as:

Reaction Rate
S1 → 2 S2 k1 · S1 · compartment
2 S2 → S1 k2 · S2 · S2 · compartment

Note the stoichiometry of S2 is 2 in both reactions.

The initial conditions are as follows:

Value Units
Initial amount of S1 1.5 × 10−3 mole
Initial amount of S2 0 mole
Value of parameter k1 0.35 second-1
Value of parameter k2 180 metre2 mole-1 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.