| http://www.w3.org/ns/prov#value | - Preferred compounds (a)(2) may be represented by any of the structures ##STR9## in which R, R', R, R2, L, and m are as previously defined; R5 and R6 are each independently alkylene (including cycloalkylene), preferably having from 1 to about 18 carbon atoms, particularly preferably from about 5 to about 12 carbon atoms, alkylarylene, or arylene, or R6 is a structure that includes a cyanuric ring,
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