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  1. Phenolphthalein | C20H14O4 | CID 4764 - PubChem

  2. Phenolphthalein - Wikipedia

  3. Phenolphthalein | C20H14O4 - ChemSpider

  4. Phenolphthalein | pH indicator, acid-base titration ...

  5. Structure of Phenolphthalein (C20H14O4) - Mol-Instincts

  6. Phenolphthalein - NIST Chemistry WebBook

  7. Phenolphthalein Indicator - Science Notes and Projects

  8. Phenolphthalein C₂₀H₁₄O₄ - Chemical Compound Info

  9. Phenolphthalein Indicator: Structure, Formula, Application, Uses