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| Company Name | Tel | Country/Region | Contact |
| CSPS Pharmaceuticals | 858 550 9636 | United States | |
| CCPIT Sub-Council of Chemical Industry | 0086-10-64223583 | China | |
| Crescent Chemical Co., Inc. | 631 348 0333 | United States | |
| Chiral Chemicals | +91 22 6633 2427 | India | |
| Cerilliant Corporation | 512 238 9974 | United States | |
| CARBOCHEM, Inc. | 610 645 9200 | United States | |
| Carolina International Sales Co., Inc. | 704 780 0122 | United States | |
| ChemPacific Corporation | 410 633 5771 | United States | |
| ChemSampCo, Inc. | 609 656 2440 | United States | |
| CHEM-IS-TRY, Inc. | 1 877 CHEM-123 (toll free) | United States | |
| CNH Technologies, Inc. | 781 933 0362 | United States | |
| CiVentiChem | 919 678 0704 | United States | |
| Covance Research Products Inc. | 510 412 8930 | United States | |
| Charkit Chemical Corporation | 203 299 3220 | United States | |
| Chiramer, Inc. | 508 393 5184 | United States | |
| CGeneTech, Inc. | 317 826 1925 | United States | |
| ChemFocus, LLC | 732 432 0294 | United States | |
| Chemizon Inc. | 303 219 8029 | United States | |
| CombiPhos Catalysts, Inc. | 609 587 6500 | United States | |
| Chemgenx, LLC | 732-246-4300 | United States | |
| Carbocore, Inc. | 281 367 6833 | United States | |
| Cuschem, Inc. | 914 374 6973 | United States | |
| China Chamber of Commerce for Import & Export of Medicines & Health Products | 010-58036292 | China | |
| Chontech, Inc. | 860 443 5196 | United States | |
| CLONTECH Laboratories, Inc. | 650 424 8222 | United States | |
| Cambrex Pharma & Biopharmaceuticals | +1 732 447 1900 | United States | |
| ChromaDex | 949 419 0288 | United States | |
| CERAC, Inc. | 414 289 9800 | United States | |
| Chemical Products Corporation | 770 382 2144 | United States | |
| Cambridge Isotope Laboratories, Inc. | 978 749-8000 | United States |