| http://www.w3.org/ns/prov#value | - with a compound of the formula MO--(CRa Rb)n --OR91, wherein M is an alkali metal and R91 is hydrogen, benzyl or benzyl substituted in the phenyl ring by halogen, C1-7 -alkyl, C1-7 -alkoxy, C1-7 -alkylenedioxy, carboxyl or trifluoromethyl; and Ra, Rb and n have the significance set forth above; or
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