The molecular formula C21H22O9 (molar mass: 418.39 g/mol) may refer to:
- Aloin, also known as barbaloin
- Liquiritin
- Natsudaidain, a flavanol
 | This set index page lists chemical structure articles associated with the same molecular formula. If an internal link led you here, you may wish to change the link to point directly to the intended article. |