Ricinine
Ricinine is a toxic alkaloid found in the castor plant. It can serve as a biomarker of ricin poisoning. It was first isolated from the castor seeds by Tuson in 1864. Ricinine has insecticidal effects. It sublimes between 170 and 180 °C at 20 mmHg. It does not form salts, and is precipitated in iodine or mercuric chloride solutions, but not in Mayer's reagent. It can be hydrolyzed to methanol and ricininic acid by alkali.