C21H21O11+
# C21H21O11+

The molecular formula $C_{21}H_{21}O_{11}^+$ (molar mass: 449.38 g/mol, exact mass: 449.108386 u) may refer to:

* Chrysanthemin or cyanidin 3-O-glucoside
* Ideain or cyanidin 3-O-galactoside, a compound found in Quintinia serrata
* Delphinidin 3-O-α-rhamnoside, a compound found in Vaccinium padifolium
