7-Hydroxymitragynine Description Description7-Hydroxymitragynine is a terpenoid indole alkaloid from the plant Mitragyna speciosa, commonly known as Kratom. Formula: C23H30N2O5 ChemSpider ID: 23152144 Acidity (pKa): 12.203 Basicity (pKb): 1.794 PubChem CID: 44301524 Molar mass: 414.502 g·mol−1 People also search for: Mitragynine, Pethidine, Heroin, Fentanyl,