-dioxides, formed by condensation of o
-sulfobenzoic acid with phenols or related compounds, e.g.
See: phenols, phthaleins
PAC, 1995, 67, 1307. 'Glossary of class names of organic compounds and reactivity intermediates based on structure (IUPAC Recommendations 1995)' on page 1370 (https://doi.org/10.1351/pac199567081307)