| http://www.w3.org/ns/prov#value | - --Y'--R1 radical wherein Y' is --O--, --S--, or --NH-- and R1 is a C1 to C12 alkyl; each of X and R4 is independently selected from the group consisting of --OCO--, --COO--, --CONH --, --NHCO--, --OCOO--, --NHCOO-- and --OCONH--; Ar is an aromatic radical having 6 to 30 carbon atoms; each of t and y is independently 0 or an integer of 1 to 6; and each of u, v and w is independently 0 or 1. 12.
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