| http://www.w3.org/ns/prov#value | - phenyl, 4-methoxy-3-chlorophenyl,4-methoxyphenyl, 2-methylphenyl or 2-methyl-4-chlorophenyl, or benzyl which is unsubstituted or substituted in the phenyl ring by halogen, such as fluorine, chlorine, bromine or iodine, eg. benzyl, 4-chlorobenzyl, 2,6-dichlorobenzyl,2-chloro-6-fluorobenzyl or 2,6-difluorobenzyl.R.sup.2 in formula I is hydrogen, a saturated or unsaturated straight-chain aliphatic ra
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