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"phoronic acid", a crystalline acid obtained by oxidizing camphoric acid; 2,6-dimethylheptan-4-one-2,6-dicarboxylic acid, HOOCC(CH₃)₂CH₂COCH₂C(CH₃)₂COOH.
Late 19th century; earliest use found in Journal of the Chemical Society. From phorone + -ic, after French phoronique.
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