| http://www.w3.org/ns/prov#value | - Suitable groups for R can include: carboxyl groups wherein R1 is methyl, ethyl, propyl, butyl, hydroxyethyl, hydroxypropyl, benzyl and the like; alkyl groups such as methyl, ethyl, propyl, butyl, hydroxyethyl, hydroxypropyl, benzyl and the like; or, aryl groups such as phenyl and the like.
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