https://doi.org/10.1351/goldbook.A00072
Compounds consisting of two @A00123@ bonded to the same oxygen atom acyl-O-acyl. Symmetric and mixed @A00354@ have identical and different @A00123@, respectively. E.g.
A00072-1.png
acetic anhydride, A00072-2.png
acetic benzenesulfonic anhydride, A00072-3.png
(thiobenzoic) anhydride.