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| Company Name | Tel | Country/Region | Contact |
| Ace Synthesis, LLC | 978 726 7885 | United States | |
| Advanced Targeting Systems | 858 642 1988 | United States | |
| AMRI | 1 877 388 4675 ext. 5151 | United States | |
| AnaSpec, Inc. | 510 791 9560 | United States | |
| AMRESCO Inc. | 440 349 1313 | United States | |
| Aakash Chemicals and Dye-Stuffs, Inc. | 630 469 3838 | United States | |
| American Radiolabeled Chemicals, Inc. | 314 991 4545 | United States | |
| Anichem Inc. | 732 821 6500 | United States | |
| AcceleDev Chemical LLC | 973 439 1845 | United States | |
| Advanced Synthesis Technologies | 619 423 7821 | United States | |
| Aceto Corporation | 516 627 6000 | United States | |
| ATI Wah Chang | 541 926 4211 | United States | |
| Advanced ImmunoChemical Incorporated | 562 434 4676 | United States | |
| Aithaca Chemical Corp. | (516) 229-2330 | United States | |
| Atlantic Equipment Engineers | 800 486 2436 | United States | |
| Aagile Labs Division of Tyger Scientific | 609 434 0144 | United States | |
| Adobechem | 0512-63010378 | China | |
| allbarvape allbarvape allbarvape | China | ||
| Allbio Pharm Co.Ltd | China | ||
| Arethusa Life Sciences Co.,Ltd. | +86(0)21-58120376 | China | |
| AmFineCom Inc. | 217 615 4034 | United States | |
| AmberMoltech LLC | 800 613 6044 | United States | |
| Alchem Pharmtech, Inc. | (848) 565-5694 | United States | |
| Affinitis Pharma, LLC | 203 648 9523 | United States | |
| Accel Pharmtech LLC | 732 993 9004 | United States | |
| Asiba Pharmatech, Inc. | (732) 993-4089 | United States | |
| AA ChemBio LLC | 858 677-9218 | United States | |
| Ark Pharm, Inc. | 847 367 3680 | United States | |
| Advanced ChemBlocks Inc. | 650 692 2368 | United States | |
| A&J Pharmtech CO., LTD. | +86 512 62560819 | China |