Loan contract dispute between Chongqing-based Rongyu Industrial Co., Ltd, the Export-Import Bank of China, Chongqing-based Qiushanyuan Real Estate Development Co., Ltd, Chongqing-based Xinhuirong Financial Leasing Co., Ltd, Chongqing-based Yinghong Real Estate Development Co., Ltd and Chongqing-based Yinghong Property Co., Ltd