| prov:value
| - wherein f is an integer from 0 to 6, preferably 2; d and e are independently integers from 0 to 5 inclusive, and preferably 2; c is an integer of from 0 to 5 inclusive, and preferably 1; q is 0 or 1; X is selected from the group consisting of --NH--, --O-- or S, and preferably --O--; Y is selected from the group consisting of --CH2 COO--, --OOCCH2 --, --CH2 CONH--, --OCH2 COO--, --NHCOCH2 --, and
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