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Citric acid - Wikipedia
Citric Acid | C6H8O7 | CID 311 - PubChem
Citric acid | C6H8O7 - ChemSpider
Citric acid | Description & Properties | Britannica
Citric acid - NIST Chemistry WebBook
Citric Acid Formula & Structure - Purdue University
Citric acid - NIST Chemistry WebBook
Citric Acid - Purdue University
Structure of Citric acid (C6H8O7) - Mol-Instincts
Citric acid | The Mole | RSC Education