| No. | Chemical Name | Cas No. | Formula | Mol. Wt. | Category |
| A0218 | Camphorquinone | 465-29-2 | C10H14O2 | 166.22 | Med |
| A0193 | Carbaryl (NAC) | 63-25-2 | C12H11NO2 | 201.22 | Pest |
| A0264 | Chlomethoxynil | 32861-85-1 | C13H9Cl2NO4 | 314.12 | Pest |
| A0119 | Chlordane | 57-74-9 | C10H6Cl8 | 409.78 | Pest |
| A0087 | cis-Chlordane | 5103-71-9 | C10H6Cl8 | 409.78 | Pest |
| A0088 | trans-Chlordane | 5103-74-2 | C10H6Cl8 | 409.78 | Pest |
| A0066 | Chlordecone | 143-50-0 | C10Cl10O | 490.63 | Pest |
| A0263 | Chlornitrofen (CNP) | 1836-77-7 | C12H6Cl3NO3 | 318.54 | Pest |
| A0280 | 2-Chloro-4-nonylphenol | Synthesis | C15H23OCl | 254.5 | Ind |
| A0284 | 2-Chloro-4-nonylphenyl 2-hydroxyethyl ether | Synthesis | C17H27O2Cl | 298.5 | Ind |
| A0275 | 3-Chlorobisphenol A | Synthesis | C15H15O2Cl | 262.5 | Ind |
| A0018 | Chlorpyrifosmethyl | 5598-13-0 | C7H7Cl3NO3PS | 322.53 | Pest |
| A0234 | Chrysene | 218-01-9 | C18H12 | 228.29 | Ind |
| A0226 | Clomiphene | 50-41-9 | C26H28ClNO/C6H8O7 | 598.1 | Med |
| A0113 | Coumestrol | 479-13-0 | C15H8O5 | 268.23 | Nat |
| A0120 | Crysin | 480-40-0 | C15H10O4 | 254.24 | Nat |
| A0256 | 4-Cyanophenol | 767-00-0 | NCC6H4OH | 119.12 | Ind |
| A0201 | Cyasterone | @ | C32H5O8 | 562.73 | Nat |
| A0210 | Cycloprothrin | 63935-38-6 | C26H21Cl2NO4 | 482.36 | Pest |
| A0207 | Cyfluthrin | 68359-37-5 | C22H18Cl2FNO3 | 434.29 | Pest |
| A0266 | Cyproterone acetate | 427-51-0 | C24H29ClO4 | 416.9 | Med |
| A0180 | Cypermethrin | 52315-07-8 | C22H19Cl2NO3 | 416.3 | Pest |
| A0206 | Cyhalothrin | 68085-85-8 | C23H19ClF3NO3 | 449.86 | Pest |