After our discussion on Feast of Fools I dug up a little online research to see what the chemical diffence was between ephedra (from the herb) and pseudoephedrine (manufactured) was.
You’ll notice that the structure is exactly the same except for a bond between the HO part of the molecule (indicated by red arrow).
Photos and research courtesy of Wikipedia entries for Ephedrine and Pseudoephedrine. Compare to the structure of Methamphetamine.
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