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  1. Citric acid - Wikipedia

  2. Citric Acid | C6H8O7 | CID 311 - PubChem

  3. Citric acid | C6H8O7 - ChemSpider

  4. Citric Acid Formula & Structure - Purdue University

  5. Citric Acid - Encyclopedia.com

  6. Citric acid: Structure, uses, intolerance, and more - Medical News Today

  7. Citric Acid - Structure, Properties, Uses of C6H8O7 - BYJU'S

  8. Citric acid - NIST Chemistry WebBook

  9. Structure of Citric acid (C6H8O7) - Mol-Instincts

  10. Citric acid | Description & Properties | Britannica