phthalides

https://doi.org/10.1351/goldbook.P04663
3,3-Di(hydrocarbyl) or 3-hydrocarbylidene-2-benzofuran-1(3H)-ones.
See:
phthaleins
Source:
PAC, 1995, 67, 1307. (Glossary of class names of organic compounds and reactivity intermediates based on structure (IUPAC Recommendations 1995)) on page 1359 [Terms] [Paper]