| http://www.w3.org/ns/prov#value | - ed from oxygen, sulfur and nitrogen, (C5-C10)aryl, (C5-C10)heteroaryl comprising from 1 to 4 hetero atoms selected from oxygen, sulfur and nitrogen, and (C5-C10)aryl(C1-C10)alkyl, these groups being optionally substituted by ???(CH2)p???OH or ???(CH2)p???NH2, wherein p is an integer from 0 to 4 inclusive, [0355] X4 represents a nitrogen atom or a group ???CR7 in which R7 is selected from hydrogen,
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