| http://www.w3.org/ns/prov#value | - G can be an alkyl group having 1 to 20 carbon atoms, an aryl group having 6 to 10 carbon atoms, such as phenyl, benzyl, tolyl, xylyl, phenethyl, 3-phenylpropyl, ethylphenyl and propyltolyl, or a monovalent group containing at least one aliphatic unsaturated group having 2 to 20 carbon atoms, the latter optionally containing one or more oxygen atoms, such as H2 C???CH--CO(O)CH2 CH2 --C(CH3)2 --CH2
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