| http://www.w3.org/ns/prov#value | - R12 denotes hydrogen, C1 -C12 -alkyl or C2 -C4 alkenyl which is optionally substituted by hydroxyl, C1 -C4 -alkoxy, carboxyl, C5 -C7 -cycloalkyl or phenylsulphonylamino, phenyl which is optionally substituted in the phenyl ring by halogen, in particular fluorine or chlorine, C1 -C4 -alkyl, hydroxyl, di-C1 -C4 -alkylamino or C1 -C4 -alkoxy, phenyl-C1 -C4 -alkyl or benzoylmethyl, C5 -C7 -cycloalkyl,
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