Phenolsulfonphthalein

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C₁₉H₁₄O₅S 354.38
Phenol red;
Phenol, 4,4′-(3H-2,1-benzoxathiol-3-ylidene)bis-,(S,S-dioxide);
3,3-Bis(4-hydroxyphenyl)-3H-2,1-benzoxathiole 1,1-dioxide [143-74-8]

DEFINITION

Phenolsulfonphthalein contains NLT 98.0% and NMT 102.0% of 4,4′-(3H-2,1-benzoxathiol-3-ylidene)bis-,(S,S-dioxide) phenol (C₁₉H₁₄O₅S), calculated on the dried basis.

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