| http://www.w3.org/ns/prov#value | - ??-amino acids of the L-series, for example glycine, phenylglycine, proline, leucine, valine, tyrosine, histidine and asparagine, in unprotected form or in N-protected form, in which the amino group is substituted by a conventional amino-protecting group; and also dicarboxylic acids, such as oxalic acid, malonic acid, mono- or di-lower alkylmalonic acids, succinic acid, glutaric acid, adipic acid,
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