| Codeine phosphate sesquihydrate | BKA0632GWS | chemical |
| Codonopsis thalictrifolia whole | M6PTY5P3CH | structurallyDiverse |
| Coelenteramide | S5MSB8RF66 | chemical |
| Coelogyne chinensis whole | RK3A4BAR48 | structurallyDiverse |
| Coenzyme A S-1,5-cyclohexadiene-1-carboxylate | 3P5T6FJJ2F | chemical |
| Coenzyme A S-benzoate trilithium | 6ZL6G9S5GY | chemical |
| Coenzyme A, S-(3-oxohexanoate) | 7C35AFG6BD | chemical |
| Cofrogliptin | LH4G6K6NKP | chemical |
| Cohibin C | 8HJM9R2AW2 | chemical |
| Coiled-coil-helix-coiled-coil-helix domain-containing protein 10, mitochondrial | RR9VJR9HUG | protein |
| Coix lacryma-jobi var. ma-yuen whole | UMO7EWQ61I | structurallyDiverse |
| Colchicide | K2D8G7N5DZ | chemical |
| Colchicide hydrochloride | KLW2JT96PJ | chemical |
| Colchicine | SML2Y3J35T | chemical |
| Colchicine conformational isomer | 7JX9WZ3SJ5 | chemical |
| Coleus australis whole | RGM60FJD9J | structurallyDiverse |
| Coleus cylindraceus whole | ZV1QU02R19 | structurallyDiverse |
| Coleus esculentus whole | 2P5HAV55E6 | structurallyDiverse |
| Coleus forsteri whole | 387QQ27W7A | structurallyDiverse |
| Coleus hadiensis whole | L8LD43M6WM | structurallyDiverse |
| Coleus livingstonei whole | 951Y4N85M3 | structurallyDiverse |
| Coleus neochilus whole | 7XN86XQ70Z | structurallyDiverse |
| Coleus rotundifolius whole | X24N37GXCP | structurallyDiverse |
| Coleus scutellarioides whole | R775IVX62S | structurallyDiverse |
| Coleus strobilifer whole | 8J9C0H04XU | structurallyDiverse |
| Coleus unguentarius whole | UG0B92030Z | structurallyDiverse |
| Colfosceril Miristate | 52QK2NZ2T0 | chemical |
| Collagenase inhibitor CI-1 | 5NK303IGZF | chemical |
| Collagenase inhibitor CI-2 | 57R6R6Y7ZA | chemical |
| Collinsella aerofaciens | 3XQ7B2S3CH | structurallyDiverse |
| Collismycin A | BZ679A8M88 | chemical |
| Colophonate | F9AB3M8FZK | chemical |
| Color Precursor No. 21 Yellow | 9NT3M2UGF5 | chemical |
| Colulintide | KX23AY2A39 | protein |
| Columbianetin | 2AUQ7TG6K2 | chemical |
| Columbianetin acetate, ( )- | 569DT6JSZ6 | chemical |
| Columbianetin acetate, (+)- | HC3XTC3R4W | chemical |
| Columbianetin acetate, (-)- | U4V5R9AL4X | chemical |
| Columbianetin, ( )- | F5Y6K7ZM44 | chemical |
| Columbianetin, (-)- | 34V6H7MNX2 | chemical |
| Comanic Acid | FEF84NM2E9 | chemical |
| Combretastatin A-1 phosphate | JH6Z94GLUD | chemical |
| Combretastatin A-1 phosphate tetrasodium salt | 3D67LX3H83 | chemical |
| Combretastatin A4, trans- | ND4BUQ9WHL | chemical |
| Combretum quadrangulare whole | H5KP59H4SM | structurallyDiverse |
| Combretum sundaicum whole | 7T89627Z2X | structurallyDiverse |
| Comekibart | B343W7ZE23 | protein |
| Commiphora mukul whole | 5I0C59K805 | structurallyDiverse |
| Commiphora sphaerocarpa whole | 8MJF9RR9A2 | structurallyDiverse |
| Complanine iodide, (+)- | H2RL893XFR | chemical |