The model contains one compartment called C. There are two species called S1 and S2 and two parameters called k1 and p1. The model contains one reaction:

Reaction Rate
S1 → S2 k1 · S1 · C

The model contains one initialAssignment:

Variable Formula
S2 p1 · S1 · time

where the symbol 'time' denotes the current simulation time.

Note: SBML's InitialAssignment take effect at time t < 0 and continue to have effect up to and including time t = 0, overriding any initial values. In this model, the initial value for the species S1 is inconsistent with the value calculated using the InitialAssignment at time = 0; the calculated value should be used.

The initial conditions are as follows:

Value Units
Initial amount of S1 1.5 × 10−2 mole
Initial amount of S2 1.5 × 10−2 mole
Value of parameter p1 −0.5 second-1
Value of parameter k1 1 second-1
Volume of compartment C 1 litre

The species' initial quantities are given in terms of substance units 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.