| http://www.w3.org/ns/prov#value | - furylmethyl, pyridylmethyl or diphenylmethyl or R1 and R2 together denote a grouping ##STR10##wherein R18 denotes hydrogen, C1 -C12 -alkyl which is optionally substituted by hydroxyl, C1 -C4 -alkoxy or phenylsulphonylamino, C5 -C7 -cycloalkyl, C2 -C12 -alkenyl, carboxyl, phenyl which is optionally substituted by halogen, in particular fluorine and chlorine, C1 -C4 -alkyl, hydroxyl, nitro, di-C1 -
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