- an alkaloid, C33H40N2O9, obtained from the root of the rauwolfia, Rauwolfia serpentina, used in the treatment of hypertension.
- an insoluble alkaloid, extracted from the roots of the plant Rauwolfia serpentina, used medicinally to lower blood pressure and as a sedative and tranquillizer. Its main adverse effect is mental depression. Formula: C 33 H 40 N 2 O 9
