GARRETT, Presiding Judge.
This is an appeal from the decision of the Board of Appeals of the United States Patent Office affirming the examiner's rejection of a claim of appellant's application for patent relating to sulfonamide derivatives. Five claims stand allowed. The appealed claim reads:
"23. A compound of the group consisting of those represented by the formula
in which X is a radical of the group consisting of H and carboxylic acid...
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