But rather than going out of business, the suppliers just altered the chemical formula a bit, changed its name and went on — legally — supplying something similar.

But canny drugmakers simply alter the chemical formula of their products and push them back out to market.

Its forms an impure solid solution that deviates markedly in composition from the simple chemical formula.

Many chemical compounds exist in different isomeric forms, which have different structures but the same overall chemical formula.

Potassium rhenide was shown to exist as a tetrahydrated complex, with the postulated chemical formula.