| http://www.w3.org/ns/prov#value | - acids have the general formula NHR"(CRR').sub.n COOH and are characterized by a basic amino group (like NH.sub.2 or NH) and an acidic carboxyl group (COOH). The letter "n" in the formula is an integer from 1 to 19, preferably 1 to 10. The R, and R'
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