| http://www.w3.org/ns/prov#value | - Preferably the chelator is selected from those of the formulas: ##STR2## wherein a, j and m are independently an integer of 1 to 3 inclusive, and most preferably 1; b is an integer from 3 to 6, inclusive, and most preferably 3; R is R1 CO-- or R1 S-- where R1 is methyl, optionally substituted lower alkyl and optionally substituted aryl, and most preferably R is R1 CO-- wherein R1 is phenyl or phen
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