Possible chemical equations:
With the proposed number of species selected, one moves to defining how these species are related. Do we have one form of A changing into another form (as happens in a protein-fold reaction)? Or do we have a bleaching reaction? Are the species related sequentially A → B → C? These are questions we cannot answer without spectra.

The answer:
2 species, 2 rates. The data were fitted to selection E: A → B → C. Since these are synthetic data, we know the answer. And our Global fitting software finds it.