The model contains one compartment called "compartment". There are two species called S1 and S2 and two parameters called k1 and k2. The model contains two reactions defined as:

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

The value of k2 is zero, which means the reverse reaction should occur at zero rate (i.e., not at all).

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 1 second-1
Value of parameter k2 0 second-1
Volume of compartment "compartment" 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.

Note: The test data for this model was generated from an analytical solution of the system of equations.