| http://www.w3.org/ns/prov#value | - Z2 and Z3 represent oxygen, Z1 represents oxygen or the group in which A is an unsubstituted or substituted, preferably unsubstituted, divalent group from an aliphatic or cycloaliphatic C2-C18 hydrocarbon, preferably the group Z4 represents oxygen or the group in which A3 is an unsubstituted or substituted, preferably unsubstituted, C2-C18 group from an aliphatic or cycloaliphatic hydrocarbon, A1
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