sulfonphthaleins 

https://doi.org/10.1351/goldbook.S06122
3,3-Bis(hydroxyaryl)-3H-2,1-benzoxathiole S,S-dioxides, formed by condensation of o-sulfobenzoic acid with phenols or related compounds, e.g.
See: phenols, phthaleins
Source:
PAC, 1995, 67, 1307. (Glossary of class names of organic compounds and reactivity intermediates based on structure (IUPAC Recommendations 1995)) on page 1370 [Terms] [Paper]
Citation: 'sulfonphthaleins' in IUPAC Compendium of Chemical Terminology, 5th ed. International Union of Pure and Applied Chemistry; 2025. Online version 5.0.0, 2025. https://doi.org/10.1351/goldbook.S06122 RIS BibTex EndNote
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Last revised: February 24, 2014