C21H22O9
The molecular formula C21H22O9 (molar mass: 418.39 g/mol, exact mass: 418.1264 u) may refer to:
- Aloin, also known as barbaloin
 - Liquiritin
 - Natsudaidain, a flavanol
 
The molecular formula C21H22O9 (molar mass: 418.39 g/mol, exact mass: 418.1264 u) may refer to: