J & K SCIENTIFIC LTD.
                            
                            Telephone18210857532; 18210857532
                            Websitehttps://www.jkchemical.com
                         
                        
                            
                                Shanghai TaoSu Biochemical Technology Co., Ltd.
                            
                            Telephone021-33632979 
                            Websitehttp://www.tsbiochem.com
                         
                        
                            
                                Shenzhen Polymeri Biochemical Technology Co., Ltd.
                            
                            Telephone+86-400-002-6226 +86-13028896684;
                            Websitehttps://www.rrkchem.com
                         
                        
                            
                                Shenzhen ruikai de biotechnology co., ltd.
                            
                            Telephone0755-61348847 17820674378
                            Websitehttp://www.real-chemstandards.com
                         
                        
                            
                                Nanjing wangzhixing Pharmaceutical Technology Co., Ltd
                            
                            Telephone 18569809817
                            Websitehttp://www.wzxchem.com
                         
                         
                            
                                Shenzhen Jianyi Biotechnology Co., Ltd
                            
                            Telephone0755-84826604 
                            Websitehttp://www.jeanchemical.com
                         
                        
                            
                                Energy Chemical
                            
                            Telephone021-58432009 400-005-6266
                            Websitehttp://www.energy-chemical.com
                         
                        
                            
                                Changzhou Xianglong Pharmaceutical Technology Co., LTD
                            
                            Telephone 18661161657
                            Websitehttp://www.xianglongpharm.com/
                         
                        
                            
                                QUALITY CONTROL SOLUTIONS LTD.
                            
                            Telephone+86-0755-66853366 +86-13670046396
                            Websitehttps://www.qcsrm.com
                         
                        
                            
                                Nantong Hanfang Biotechnology Co. , Ltd.
                            
                            Telephonehanfangpharma@126.com; 18616537568
                            Websitehttps://hanfangpharma@126.com
                         
                         
                            
                                Hubei Moco Chemical Co., Ltd.
                            
                            Telephone18627753421; 18627756402
                            Websitehttp://www.molcoo.com/
                         
                        
                            
                                TLC Pharmaceutical Standards Ltd.
                            
                            Telephone18012923235; 18012923235
                            Websitehttp://www.tlcstandards.com
                         
                        
                            
                                Hubei Rhema Reference Materials Technology Co., Ltd.
                            
                            Telephone 15787875101
                            Websitehttps://www.chemicalbook.com/supplier/138770565/
                         
                        
                            
                                Hubei YoungXin Pharmaceutical Tech Co.,Ltd.
                            
                            Telephone18696290611 18696290611
                            Websitehttp://www.yongstandards.com/