Private equity firm Czura Thornton Ltd. has put Chiltern International Ltd., a clinical research company, up for sale for more than 200 million pounds ($329 million), the Mail on Sunday reported, without saying where it got the information. Czura Thornton has hired Goldman Sachs Group Inc. (GS) to auction Chiltern, and aims to double its investment from when it bought the company five years ago, the newspaper said. Potential bidders include CCMP Capital Advisors LLC, the Mail said.