| No. | CAS # | Product Names | Molecular Formula |
| 501 | 26523-78-4 | Tris(nonylphenyl) phosphite | C45H69O3P |
| 502 | 19186-97-1 | Tris(tribromoneopenthyl)phosphate | C15Br9H24PO4 |
| 503 | 14694-95-2 | Tris(triphenylphosphine)chlororhodium | C54H45ClP3Rh |
| 504 | 15529-49-4 | Tris(triphenylphosphine)ruthenium(II) chloride | C54H45Cl2P3Ru |
| 505 | 76857-14-2 | Trisodium 4-carboxy-5-mercapto-3-hydroxy-isothiazole | C4H2NNa3O3S2 |
| 506 | 68-04-2 | Trisodium citrate | C6H5Na3O7 |
| 507 | 13775-53-6 | Trisodium hexafluoroaluminate | Na3AlF6 |
| 508 | 7785-84-4 | Trisodium trimetaphosphate | Na3P3O9 |
| 509 | 638-16-4 | Trithiocyanuric acid | C3H3N3S3 |
| 510 | 1330-78-5 | Tritolyl phosphate | C21H21O4P |
| 511 | 139481-72-4 | Trityl candesartan | C43H34N6O3 |
| 512 | 138402-10-5 | Trityl Irbesartan | C44H42N6O |
| 513 | 144690-92-6 | Trityl olmesartan | C48H44N6O6 |
| 514 | 546-46-3 | Trizinc dicitrate | Zn3（C6H5O7）2 |
| 515 | 2893-78-9 | troclosene sodium | C3Cl2N3NaO3 |
| 516 | 77-86-1 | Trometamol | C4H11NO3 |
| 517 | 529-64-6 | Tropic acid | C9H10O3 |
| 518 | 1508-75-4 | Tropicamide | C17H20N2O2 |
| 519 | 89565-68-4 | TROPISETRON | C17H20N2O2 |
| 520 | 533-75-5 | Tropolone | C7H6O2 |
| 521 | 10405-02-4 | Trospium chloride | C25H30NO3.Cl |
| 522 | 9002-07-7 | Trypsin | C6H15O12P3 |
| 523 | 280755-12-6 | Tulathromycin B | C41H79N3O12 |
| 524 | 56776-01-3 | Tulobuterol hydrochloride | C12H19Cl2NO |
| 525 | 41570-61-0 | Tulobuterol | C12H18ClNO |
| 526 | 12070-12-1 | tungsten carbide | |
| 527 | 7783-82-6 | Tungsten hexafluoride | WF6 |
| 528 | 1314-35-8 | tungsten trioxide | WO3 |
| 529 | 8006-64-2 | Turpentine, oil | |
| 530 | 9005-90-7 | Turpentine | |
| 531 | 9005-64-5 | Tween 20 | C18H34O6.（C2H4O）n |
| 532 | 9005-66-7 | Tween 40 | |
| 533 | 9005-67-8 | Tween 60 | C24H46O6.(C2H4O)n |
| 534 | 9005-71-4 | TWEEN 65 | |
| 535 | 9005-65-6 | Tween 80 | |
| 536 | 9005-70-3 | Tween 85 | C60H108O8.(C2H4O)n |
| 537 | 60-19-5 | Tyramine hydrochloride | C8H11NO.HCl;C8H12ClNO |
| 538 | 51-67-2 | Tyramine | C8H11NO |
| 539 | 60-18-4 | tyrosine | C9H11NO3 |