| Class | Type | Role | Example |
|---|---|---|---|
Nitroge | Alkaloids | Neurotoxin | Nicotine in tobacco |
| Glycosides | Inhibit electron transport | Dhurrin in sorghum | |
| Nonprotein amino acids | Disrupt protein structure | Canavanine in jack bean | |
Nitroge | Glucosinolates | Inhibit respiration | Methylglucosinolate in cabbage |
Phenolics | Coumarins | Block cell division | Umbelliferone in carrots |
| Flavonoids | Phytoalexins | Capsidol in peppers | |
| Tannins | Inhibit enzymes | Gallotannin in oak trees | |
Terpenes | Monoterpenes | Neurotoxins | Pyrethrin in chrysanthemums |
| Diterpenes | Disrupt reproduction and muscle function | Gossypol in cotton | |
| Triterpenes | Inhibit transport | Digitalis in foxglove | |
| Sterols | Block animal hormones | Spinasterol in spinach | |
| Polyterpenes | Deter feeding | Latex in Euphorbia |