D&C Red No. 21

**Semantic type:** Indicator, Reagent, or Diagnostic Aid|Organic Chemical

**Synonyms:** - 2-(3,6-Dihydroxy-2,4,5,7-tetrabromoxanthen-9-yl)-benzoic Acid - Bromeosin - D&C RED NO. 21 - Eosin Y Spirit Soluble - Eosine Acid - Fluorescein, 2',4',5',7'-tetrabromo- - Japan Red 223 - Solvent Red 43 - Spiro(isobenzofuran-1(3H),9'-(9H)-xanthen)-3-one, 2',4',5',7'-tetrabromo-3',6'-dihydroxy-