| http://www.w3.org/ns/prov#value | - he groups CH2 or CF2 in the Q1, Q2 and Q3 may be replaced by at least one group selected from the group consisting of --O--, --S--, --CO--, --CHX-- in which X is a halogen atom, --CHCN--, --O--CO--, --O--COO--, --CO--O-- and --CH???CH-- in such a manner that two hetero atoms do not bind directly. 21.
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