Functional group
| Functional group | Formula | Structure |
| acetoxy | -OCOCH3 | |
| acetyl | -COCH3 | |
| acryloyl | -COCH=CH2 | |
| allyl | -CH2CH=CH2 | |
| amino | -NH2 | |
| amyl | -C5H11 | = pentyl |
| benzoyl | -COC6H5 |  |
| benzyl | -CH2C6H5 |  |
| benzyloxy |  | |
| butyl | -C4H9 | |
| butyryl | -COC3H7 | |
| carbamoyl | -CONH2 | |
| carbonyl | -CO- | |
| carboxy | -COOH | |
| cetyl | -C16H33 | |
| cinnamoyl | -COCH=CHC6H5 |  |
| cinnamyl | -CH=CHC6H5 |  |
| cresyl | ||
| cyano | -CN | |
| cyclohexano |  | |
| 3-cyclohexen-1-yl |  | |
| cyclohexyl | -C6H11 |  |
| cyclopentano |  | |
| decyl | -C10H21 | |
| dodecyl | -C12H35 | |
| epoxy | ||
| ethoxy | -OC2H5 | |
| ethyl | -C2H5 | |
| formyl | -CHO | |
| 2-furanyl |  | |
| furfuryl | ||
| glycidyl | ||
| heptyl | -C7H15 | |
| hexyl | -C6H13 | |
| hydrazino | -NHNH2 | |
| hydroxy | -OH | |
| isoamyl | ||
| isobutyl | ||
| isohexyl | ||
| isopentyl | ||
| isopropyl | ||
| isothio | ||
| isothiocyanato | -NCS | |
| mercapto | -SH | |
| methoxy | -OCH3 | |
| methyl | -CH3 | |
| methylthio | -SCH3 | |
| 1-naphthyl | -C10H7 |  |
| 2-naphthyl | -C10H7 |  |
| nitro | -NO2 | |
| nitroso | -NO | |
| nonyl | -C9H19 | |
| octyl | -C8H17 | |
| pentyl | -C5H11 | |
| phenoxy | -OC6H5 |  |
| phenyl | -C6H5 |  |
| phosphoryl | ||
| 2-picolyl |  | |
| 3-picolyl |  | |
| 4-picolyl |  | |
| piperidino |  | |
| propenyl | -CH=CHCH3 | |
| propionyl | -COC2H5 | |
| propyl; | -C3H7 | |
| 2-pyridyl |  | |
| 3-pyridyl |  | |
| 4-pyridyl |  | |
| 2-pyrimidyl |  | |
| styryl | -CH=CHC65 |  |
| sulfamoyl | -SO2NH2 | |
| sulfo | -SO3H | |
| sulfonyl | -SO2- | |
| 4-thiazoyl |  | |
| 2-thienyl |  | |
| 3-thienyl |  | |
| thionyl | =SO | |
| tolyl | -C6H5CH3 |  |
| tosyl | -O2SC6H4CH3 |  |
| trityl | -C(C6H5)3 | |
| undecyl | -C11H23 | |
| ureido | -NHCONH2 | |
| vinyl | -CH=CH2 | |
| xylyl |  | |
| xylyloxy |  | |