| Cyanamide | 420-04-2 | Other substances | 1 |
| Cyclic Adenosine Monophosphate | 60-92-4 | Other substances | 1 |
| Cyclopentanone | 120-92-3 | | 1 |
| Cyclopentolate Hydrochloride | 5870-29-1 | | 1 |
| Cyclopentyl Mandelic Acid | 427-49-6 | Diuretics | 1 |
| Cyclopropane Methanol | 2516-33-8 | Intravenous anesthetics | 1 |
| Cyclopropyl bromide | 4333-56-6 | | 1 |
| Cyclopropyl-1-Piperazinylmethanone As Hcl | 59878-57-8 | Intermediates | 1 |
| Cyclopropylmethyl Bromide | 7051-34-5 | Other substances | 1 |
| Cytidine Diphosphate Trisodium | 203787-91-1 | | 1 |
| D-Asparagine | 2058-58-4 | Other substances | 1 |
| D-Cysteine | 921-01-7 | Other substances | 1 |
| D-Glutamic Acid | 6893-26-1 | Other substances | 1 |
| D-Leucine | 328-38-1 | Other substances | 1 |
| D-Proline | 344-25-2 | Other substances | 1 |
| D-Xylitol | 488-81-3 | Other substances | 1 |
| D-isomer Levofloxacin | 59319-72-1 | Quinolones | 1 |
| Dabigatran | 211914-51-1 | Anticoagulants | 1 |
| Dabrafenib + Trametinib | | | 1 |
| Dacomitinib | 1110813-31-4 | | 1 |
| Damiana herb | | Herbal remedies | 1 |
| Dandelion | | Herbal remedies | 1 |
| Dapagliflozin Intermediates | | | 1 |
| Dapagliflozin intermediate | | | 1 |
| Dapiprazole | 72822-12-9 | Alpha blockers | 1 |
| Darbufelone | 82159-09-9 | Other anti-inflammatory agents | 1 |
| Dbco-(Peg)3-Vc-Pab-Mmae | 2754384-60-4 | | 1 |
| Dbco-Peg4-Dbco | 2182601-68-7 | | 1 |
| Deboc-Cabazitaxel | 1638286-64-2 | | 1 |
| Decylamine | 2016-57-1 | Reagents and solvents | 1 |
| Decylaminoquat | | | 1 |
| Dehydroclomipramine Hydrochloride | | Tricyclic antidepressants | 1 |
| Deracoxib | 169590-41-4 | Anti-inflammatory Agents | 1 |
| Deruxtecan | 1599440-13-7 | | 1 |
| Deslanoside | 17598-65-1 | Cardiac glycosides | 1 |
| Desulfo-Coenzyme A | 5863-40-1 | Solvents | 1 |
| Dex-Medetomidine Hydrochloride | 145108-58-3 | | 1 |
| Dexamethasone dipropionate | 55541-30-5 | Corticosteroids | 1 |
| Dexamethasone isonicotinate | 2265-64-7 | Corticosteroids | 1 |
| Dexketoprofen Tromethamine | 156604-79-4 | | 1 |