| http://www.w3.org/ns/prov#value | - R1 is C1-C4alkyl substituted by carboxyl or ???COOZ, in which Z is hydrogen, C1-C4alkyl or phenyl or in which Z is C1-C4alkyl substituted by ???(COO???)nMn+, in which n is a number 1-3 and M is a metal ion from the first, second or third group of the Periodic Table or is Zn, Cu, Ni or Co, or M is a group Nn+(R2)4, in which R2 is C1-C8alkyl or benzyl,
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