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Qingdao Twell Sansino Import & Export Co., Ltd.
Tianjin Haitong Chemical Industrial Co., Ltd.
Shanghai Kangxin Chemical Co., Ltd.
Wuhan Dahua Weiye Pharmaceutical Chemical Co., Ltd.
Wuhan Wang Lianshang Biotechnology Co., Ltd.
Dalian Chem Imp.& Exp. Group Co., Ltd.