| http://www.w3.org/ns/prov#value | - (2) Alkyl groups (preferably having 1-6 C atoms): these can contain non-water-solubilising substituents, such as fluorine atoms, hydroxyl or cyano groups, or groups of the formulae --OR7, --OCOR6, --COOR6, --CONR7 R8 or --R6 --OCONHR6 wherein R6 is alkyl (preferably C1 -C6 -alkyl), aryl, for example naphthyl, or phenyl which is unsubstituted or substituted by halogen, C1 -C6 -alkyl or -alkoxy, or
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