You can look up the following companies and ask about them, and compare them with others.
Biphenyldiphenyl tablets - Manufacturers:
Beijing Zizhu Pharmaceutical Co. Ltd. (former North China Pharmaceutical Factory Starch Branch)(GMP)
Hebei Xingtai Niucheng Pharmaceutical Factory
Hebei Dongfeng Pharmaceutical Co. Ltd.(GMP)
Shanxi Boda Pharmaceutical Co. Ltd. (former Chifeng Songzhou Pharmaceutical Factory) (GMP)
Chifeng Weikang Biochemical Pharmaceutical Co.
Liaoning Beiqi Pharmaceutical Limited (Dandong Jinjiang Pharmaceutical Co., Ltd.)(GMP)
Liaoning Dandong Medical Chuang Pharmaceutical Co. Ltd. (former Changchun Hongqi Pharmaceutical Factory)(GMP)
Jilin Changchun People's Pharmaceutical Co., Ltd.(former Lukang Pharmaceutical Co., Ltd.)(GMP)
Jilin Tonghua Changqing Pharmaceutical Co.
Jilin Chemical Industry Corporation Liaoyuan Pharmaceutical Limited Liability Company (Liaoyuan Pharmaceutical No.1 Plant)
Helongjiang Hakaoke Group White Swan Pharmaceutical Co. GMP)
Heilongjiang Heibao Pharmaceutical Co., Ltd.(GMP)
Ha Gaoke White Swan Pharmaceutical Group Co. Ltd. (former Nanjing Second Pharmaceutical Factory)(GMP)
Jiangsu Yunyang Group Pharmaceutical Co. Ltd. (former Fengxian Pharmaceutical Factory)(GMP)
Jiangsu Dahongying Hengshun Pharmaceutical Co. Ltd.(GMP)
Zhejiang Medicine Company Limited Xinchang Pharmaceutical Factory(GMP)
Zhejiang Jinjiang Pharmaceutical Co. Ltd. (former Xiamen Pharmaceutical Factory) (GMP)
Jiangxi Guoyao Pharmaceutical Co. Ltd. (East China Pharmaceutical Co., Ltd.)
Shandong Jinan Hengji Pharmaceutical Co., Ltd (former Jintai Pharmaceutical Factory)
Shandong Province, Yantai Luyin Pharmaceutical Co. Ltd. (former Hebi City Pharmaceutical Factory) (GMP)
Henan Botai Pharmaceutical Co. Ltd.(GMP)
Hubei Huangshi Changzheng Pharmaceutical Co.
Guangzhou Maite Xinghua Pharmaceutical Co. Ltd. (former Huizhou Pharmaceutical Factory) (GMP)
Guangdong Luofushan Pharmaceutical Co. Ltd. (former Ningxia Pharmaceutical Factory, Ningxia Traditional Chinese Medicine Factory)(GMP)
Gansu Qilianshan Pharmaceutical Factory (GMP)
Ningxia Qiyuan Pharmaceutical Co.