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cyclic acid anhydrides/cyclic anhydrides:* definition

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Acid anhydrides derived by loss of water between two oxoacid functions RkE(=O)l(OH)m (l not equal to 0) (carboxylic, sulfonic, etc.) in the same molecule so as to close a ring. NOC Rules C-491.4, C-643.2. Oxo oxygen replacement analogues are included. Cf. thioanhydrides. E.g.

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