11. Indole is one of the constituent of perfumery importance present in buds.12. It can also be indole positive or negative depending on the biotype. 13. In his book " De conditione et indole rusticorum in Hungaria" 14. Some indole alkaloids interact with other types of receptors. 15. This is a fairly common phenomenon, see e . g . indole . 16. It is now known that betalains are aromatic indole derivatives synthesized from tyrosine. 17. This enzyme participates in indole and ipecac alkaloid biosynthesis. 18. It represents an entirely new family of indole derivatives. 19. It focuses on building the tetracyclic unit before introducing the second indole unit. 20. Certain indole derivatives were important dyestuffs until the end of the 19th century.
