(Fierce Biotech) GlaxoSmithKline (NYSE: GSK) has ordered two Sirtris executives– Christoph Westphal and Michelle Dipp–to stop selling a Resveratrol dietary supplement based on the drug the two companies have in development.In 2008, GSK forked over $720 million for access to Sirtris’ pipeline of drugs based on resveratrol, a compound found in red wine that’s thought to increase