phenolphthalein
/ˌfiːnɒlˈfθæliːn/noun
mass noun
1- Chemistry a colourless crystalline solid (pink in alkaline solution) used as an acid-base indicator and medicinally as a laxative【化】酚酞。
1.1
- Chem. formula: C20H14O4.化学分子式： C20H14O4.
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