cyclic acid anhydride
cyclic acid anhydride
Acid anhydrides derived by loss of water between two oxoacid functions R<small><sub><em>k</em></sub></small>E(=O)<small><sub><em>l</em></sub></small>(OH)<small><sub><em>m</em></sub></small> (<em>l</em> ≠ 0) (carboxylic, sulfonic, etc.) in the same molecule so as to close a ring.