For the purposes of the prosecution of an offense under this subchapter involving the manufacture, delivery, or possession of a controlled substance, Penalty Groups 1, 1-A, 1-B, 2, and 2-A include a controlled substance analogue that:
(1) has a chemical structure substantially similar to the chemical structure of a controlled substance listed in the applicable penalty group; or
(2) is specifically designed to produce an effect substantially similar to, or greater than, a controlled substance listed in the applicable penalty group.