| Member | Definition | Role |
|---|
| castanospermine | A tetrahydroxyindolizidine alkaloid that consists of octahydroindolizine having four hydroxy substituents located at positions 1, 6, 7 and 8 (the 1S,6S,7R,8R,8aR-diastereomer). | castanospermine |
| lycorine | An indolizidine alkaloid that is 3,12-didehydrogalanthan substituted by hydroxy groups at positions and 2 and a methylenedioxy group across positions 9 and 10. Isolated from Crinum asiaticum, it has been shown to exhibit antimalarial activity. | lycorine |
| swainsonine | An indolizidine alkaloid isolated from the plant Swainsona canescens with three hydroxy substituents at positions 1, 2 and 8. | swainsonine |