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  1. Citric acid - Wikipedia

  2. Citric Acid | C6H8O7 | CID 311 - PubChem

  3. Citric acid | C6H8O7 - ChemSpider

  4. Citric acid | Description & Properties | Britannica

  5. Citric acid - NIST Chemistry WebBook

  6. Citric Acid Formula & Structure - Purdue University

  7. Citric acid - NIST Chemistry WebBook

  8. Citric Acid - Purdue University

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

  10. Citric acid | The Mole | RSC Education