PFE invests $50M in IPO of Shanghai Pharma: http://www.reuters.com/article/2011/05/03/us-shanghaipharmaipo-idUSTRE74217L20110503 The companies previously announced plans to work together on drug development in China (http://www.marketwatch.com/story/pfizer-and-shanghai-pharmaceutical-sign-memorandum-of-understanding-for-potential-strategic-partnership-2011-04-20-1320360 ).