ASTX BRIEF-Otsuka to acquire Astex Pharmaceuticals Inc for JPY 90 billion - Nikkei 1:25 PM Eastern Daylight Time Sep 04, 2013 Sept 5 (Reuters) - Nikkei: * Otsuka Holdings Co Ltd <4578.T> has decided to acquire Astex Pharmaceuticals Inc <ASTX.O> for an estimated JPY 90 billion - Nikkei * Source text - http://link