| http://www.w3.org/ns/prov#value | - in which E is a n-valent group and n is an integer from 1 to 4, (ii) a divalent group of formula IIb ##STR3## in which R is a divalent group chosen from --SO2 --, --SO--, --CMe2 --, --O--, --C(CF3)2 --, --CH2 -- or --CO--, (iii) a group of formula IIc ##STR4## in which F is as defined in (ii) above, (iv) a divalent group of formula IId ##STR5## or (v) a divalent group of formula IIe ##STR6## in wh
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