| http://www.w3.org/ns/prov#value | - or an aryl; R13 is selected from R6, ???R5???O???B, ???R5???N???(B)2. and ???R5???R3 and mixtures thereof; R14 is independently selected from H and/or R2 as defined above; and R15 is independently selected from H and/or R2 as defined above, provided that at least one of R14 and R15 are other than H; v is 1-100; w is 2-100; x is 0-100; y is 0-100; z is 0-100; and provided that the sum of x and z i
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