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 0-dimensional. The model contains two reactions defined as:

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

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 0.75 mole-1 second-1
Value of parameter k2 0.25 second-1

In this example, the compartment has its spatialDimensions attribute set to zero, i.e., it represents a point and therefore cannot have size or units. The species values must be treated as amounts and not concentrations.