Private equity firm CVC Capital Partners on Monday agreed to buy German perfume retailer Douglas from US buyout group Advent and the Kreke family for an undisclosed sum. The Kreke family, which held a 20 percent stake, will reinvest in Douglas through a joint holding company, CVC said in a statement. The acquisition does not include the book retailer Thalia and the fashion retailer AppelrathCuepper, the statement said.