By Dominique Vidalon PARIS (Reuters) – Dassault Systemes has agreed to buy U.S. scientific software firm Accelrys in an all-cash deal valuing the San-Diego company at about $750 million, as it seeks to expand its product portfolio, the software company said on Thursday. The French maker of computer-assisted design programs said it would self-finance the offer for Accelrys, which provides scientific software for the energy, aerospace and industrial goods sectors, at a price of $12.50 per share. “Our ambition is to offer solutions in all areas of bio sciences where we want to be leader,” Dassault Systemes CEO Bernard Charles told Reuters by phone. The board of Accelrys, whose clients include Sanofi, L’Oreal and Unilever has unanimously approved the transaction which is expected to be completed during the second quarter of 2014, Dassault said.