@book{47,
	author = {Block, John H and John H.Beale Jr.},
	title = {Wilson and Gisvold's textbook of organic medicinal and pharmaceutical chemistry /},
	publisher = {Lippincott Williams & Wilkins,},
	year = {c2004.},
	address = {Philadelphia :},
	edition = {11th ed.},
	url = {http://www.loc.gov/catdir/enhancements/fy0712/2003048849-d.html}
}