What the devil is in your phytomedicine? Exploring species substitution in Harpagophytum through chemometric modeling of 1H-NMR and UHPLC-MS datasets

The results showed that Harpagophytum procumbens and H. zeyheri are not chemically equivalent and therefore should not be used interchangeably as a source of Devil's Claw as proposed in the pharmacopoeias.166