MUMBAI: Blackstone, Birla Corp and Baring Private Equity Asia are in the final race to acquire the cement business of Anil Ambani's Reliance Infrastructure. The three have been shortlisted for the final round of negotiations from seven suitors that had shown initial interest, said multiple sources with knowledge of the development. So far, Blackstone is believed to have made the most aggressive offer, two of the sources said. But this could not be independently verified.