The model contains three varying parameters called S1, S2 and S3 and two constant parameters called k1 and k2. (Note that indeed S1, S2 and S3 are parameters and not species in this model.)

The model contains three rules:

Type Variable Formula
Assignment S3 multiply(k1, S2)
Rate S1 −multiply(k2, S1)
Rate S2 k2 · S1

The model contains one functionDefinition defined as:

Id Arguments Formula
multiply x, y x · y

Note the initial value for parameter S3 is undeclared and must be calculated using the assignmentRule.

The initial conditions are as follows:

Value Units
Value of parameter S1 1 any
Value of parameter S2 0.5 same as S1
Value of parameter S3 undeclared any
Value of parameter k1 0.7 (units of S3) (units of S1)-1
Value of parameter k2 40 second-1