The model contains one compartment called C. There are three species called S1, S2 and S3 and three parameters called k1, k2 and p1. Compartment C is 2-dimensional. The model contains two reactions defined as:

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

The model contains one initialAssignment:

Variable Formula
C p1 · 2

Note: SBML's InitialAssignment construct override any declared initial values. In this case the initial value declared for compartment C is inconsistent with the value returned by the InitialAssignment.

The initial conditions are as follows:

Value Units
Initial amount of S1 1.0 × 10−1 mole
Initial amount of S2 2.0 × 10−1 mole
Initial amount of S3 1.0 × 10−1 mole
Value of parameter k1 7.5 metre2 mole-1 second-1
Value of parameter k2 2.5 second-1
Value of parameter p1 0.5 metre2
Area of compartment C 3.5 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) they must be treated as concentrations where they appear in expressions.