The model contains one compartment called C. There are three species called S1, S2 and S3 and one parameter called k. The model contains one reaction that has a kinetic law that defines second order mass action kinetics with two reactants (as referenced by SBO:0000054):

Reaction Rate
S1 + S2 → S3 k · S1 · S2 · C

The initial conditions are as follows:

Value Units
Initial amount of S1 1.0 mole
Initial amount of S2 0.5 mole
Initial amount of S3 0 mole
Value of parameter k 1.1 litre mole-1 second-1
Volume of compartment C 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.