@book{49,
	author = {Ikan, Raphael,},
	title = {Natural products :},
	publisher = {Academic Press,},
	year = {c1991.},
	address = {San Diego, Calif. :},
	edition = {2nd ed.},
	url = {http://www.loc.gov/catdir/description/els032/91012738.html}
}