| http://www.w3.org/ns/prov#value | - R3 is C5 -C6 cycloalkylene or a straight-chained or branched, saturated or unsaturated aliphatic hydrocarbon chain containing 2-8 carbon atoms, which is unsubstituted or substituted one or more times by hydroxyl, phenyl, alkoxy-carbonyl, alkylthio, acylated amino or by alkoxy which is unsubstituted or is substituted by phenyl or alkoxy, R4 is --CH2 --CH2, R5 is a hydrogen atom or a lower alkyl rad
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