isocoumarins

https://doi.org/10.1351/goldbook.I03267
Isocoumarin (1H-isochromen-1-one) and its derivatives formed by substitution.
I03267.png
See: coumarins
Source:
PAC, 1995, 67, 1307. 'Glossary of class names of organic compounds and reactivity intermediates based on structure (IUPAC Recommendations 1995)' on page 1344 (https://doi.org/10.1351/pac199567081307)