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 1-dimensional. Species S1, S2 and S3 are declared to have only substance units. 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 mole
Initial amount of S2 2.0 mole
Initial amount of S3 1.5 mole
Value of parameter k1 7.5 mole-1 second-1
Value of parameter k2 0.3 second-1
Length of compartment "compartment" 1 metre

The species have been declared as having substance units only. Thus, they must be treated as amounts where they appear in expressions.