The molecular formula C21H24O11 (molar mass: 452.41 g/mol, exact mass: 452.131862 u) may refer to:
- Aspalathin, a dihydrochalcone glucoside
 - Catechin-5-O-glucoside, a flavan-3-ol glucoside
 - Catechin-7-O-glucoside, a flavan-3-ol glucoside
 
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