Trilax
PubChem Notes:
Phenolphthalein An acid-base indicator which is colorless in acid solution, but turns pink to red as the solution becomes alkaline. It is used medicinally as a cathartic.
MediLexicon phenolphthalein - Medical Dictionary Definition for Term 'phenolphthalein'
[1. A hydrogen ion indicator obtained by the action of phenol on phthalic anhydride; formerly used as a laxative.
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