(7) Any person who is convicted of violating Section 11379.6 of the Health and Safety Code by manufacturing or offering to perform an act involving the manufacture of phencyclidine or any of its analogs or precursors.
As used in this section "manufacture" refers to the act of any person who manufactures, compounds, converts, produces, derives, processes, or prepares, either directly or indirectly by chemical extraction or independently by means of chemical synthesis.