| http://www.w3.org/ns/prov#value | - atoms or benzyl; X represents benzyl, --OR.sup.4, --SR.sup.4, --SO--R.sup.4, R.sup.4 being phenyl radical which may be substituted in any position, once or several times, by, for example Cl, OH, CF.sub.3, straight-chain or branched alkyl of 1 to 3 carbon
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