Is 3,3-Bis(4-hydroxyphenyl)phthalide vegan?

Phenolphthalein is also known as 3,3-Bis(4-hydroxyphenyl)phthalide.

Phenolphthalein is a synthetic chemical compound with formula C20H14O4, widely used as a pH indicator in acid-base titrations, turning colorless in acidic solutions and pink in basic solutions.

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