NEW YORK/WASHINGTON (Reuters) – Pfizer Inc’s (PFE.N) talks to acquire Allergan Plc (AGN.N) in a $150 billion deal that would see the U.S. drug giant redomicile in Ireland accelerated on Wednesday, as the U.S. Treasury prepared to clamp down further on such tax inversions. Pfizer is negotiating a price of $370 to $380 for each Allergan share, a person familiar with the discussions said, asking not to be identified because the talks are confidential. Allergan shares ended trading on Wednesday at $310.8 per share.