1) An alkaloid 
Ajmalan is a parent hydride used in the IUPAC nomenclature of natural products and also in CAS nomenclature. It is a 20-carbon alkaloid with six rings and seven chiral centres. The name is derived from ajmaline, an antiarrhythmic alkaloid isolated from the roots of Rauwolfia serpentina which is formally a dihydroxy-derivative of ajmalan. The –an...
an alkaloid*