There are other plant links for the metabolites of fentanyl-carfentanil. Already shown, Fu-f-diydrodiol is C24H28N2O4. Rubradinine C24H28N2O4, an alkaloid from Adina rubrostipulata has been shown to be identical with mitraphylline.
Wiki: Mitraphylline: '....in leaves of Mitragyna speciosa, commonly known as kratom.'
Wiki: Mitraphylline: '....in leaves of Mitragyna speciosa, commonly known as kratom.'