ose*** Pfizer announces deal to divest infant nutrition business to Nestle for $11.85B cash (high end) premium) (Reuters) AstraZeneca to acquire Ardea Biosciences (RDEA) for $1 billion ($32/share = 53.5% Amylin Pharmaceuticals said to be exploring a sale (hires CS & GS as advisers) Wal-Mart probe of possibly