Labeled Reserpine. An indole alkaloid found in Rauwolfia serpentina. Inhibits vesicular uptake of catecholamines and serotonin. Reserpine is reasonably anticipated to be a human carcinogen. Antihypertensive.Form:Off-White SolidMelting Point:>218°C (dec.)Solubility:Chloroform, Hot Methanol