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GlaxoSmithKline to Acquire Sirtris Pharmaceuticals, a World Leader in 'Sirtuin' Research and Development
Date:4/22/2008

employees and continue the entrepreneurial and innovative culture they created."

Sirtris will become part of GSK's Drug Discovery organisation, while continuing to operate from laboratories in Cambridge, Massachusetts as an autonomous drug discovery unit. Christoph Westphal, CEO and Vice Chair of Sirtris and the management team will continue to lead this autonomous unit.

Dr. Westphal commented, "We have built a dynamic and scientifically-driven organisation. We expect this transaction will accelerate our vision to target sirtuins to treat diseases of metabolism and ageing and deliver tremendous value to patients, our shareholders and our employees. We look forward to working with GlaxoSmithKline and their world-class research, development and commercialisation organisation."

Under the agreement, a subsidiary of GSK will commence a cash tender offer to purchase all of the outstanding shares of Sirtris, at USD22.50 (or approx. GBP11.33) per share followed by a second step merger in which any untendered Sirtris shares would be acquired at the same price per share. All outstanding stock options will be cancelled with holders receiving the excess of the transactions price over the exercise price. The acquisition has been approved by the board of directors of each company and is subject to customary closing conditions, including the tender of at least a majority of Sirtris's shares and clearance under the Hart-Scott-Rodino Antitrust Improvements Act. The parties anticipate that the tender offer will be commenced in early May and close in the second quarter of 2008.

About GSK

GSK -- one of the world's leading research-based pharmaceutical and healthcare companies -- is committed to improving the quality of human life by enabling people to do more, feel better and live longer. For company information including a copy of this announcement and details of the company's updated product development pipeline, visit GSK at

SOURCE GlaxoSmithKline
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