A large pharmaceutical corporation formed from the merger of GlaxoWellcome (which in turn was Glaxo and Burroughs Wellcome, which owned Coopers among other companies) and SmithKline-Beecham (once Smith, Kline & Company, French, Richards & Company, and Beecham Group Ltd). Makes a large variety of drugs including Valtrex and Zovirax for genital herpes, Amoxil (amoxicillin), Flonase nasal spray, Dexedrine, Imitrex, Paxil for Social Anxiety Disorder, Serevent, Tabloid, Tagamet and Zantac for heartburn, Wellbutrin, Zyban to help you quit smoking, and many, many more.
Just to be funny, they should merge with PriceWaterhouseCoopers to become GlaxoSmithKlinePriceWaterhouseCoopers. Try to fit that on a business card.